increment version and upgrade librairies
authorymh <ymh.work@gmail.com>
Sat, 25 Jan 2020 02:22:57 +0100
changeset 98 a14feef87fd7
parent 97 a5b9bb4dd63d
child 99 769226b3a38e
increment version and upgrade librairies
virtualenv/res/lib/lib_create_env.py
virtualenv/res/src/lxml-2.3.4.tar.bz2
virtualenv/res/src/lxml-4.4.2.tar.gz
virtualenv/res/src/psycopg2-2.4.5.tar.gz
virtualenv/res/src/psycopg2-2.8.4.tar.gz
virtualenv/web/virtualenv.py
virtualenv/web/virtualenv_support/distribute-0.6.24.tar.gz
virtualenv/web/virtualenv_support/pip-1.1.tar.gz
virtualenv/web/virtualenv_support/pip-19.1.1-py2.py3-none-any.whl
virtualenv/web/virtualenv_support/pip-19.3.1-py2.py3-none-any.whl
virtualenv/web/virtualenv_support/setuptools-0.6c11-py2.4.egg
virtualenv/web/virtualenv_support/setuptools-0.6c11-py2.5.egg
virtualenv/web/virtualenv_support/setuptools-0.6c11-py2.6.egg
virtualenv/web/virtualenv_support/setuptools-0.6c11-py2.7.egg
virtualenv/web/virtualenv_support/setuptools-42.0.2-py2.py3-none-any.whl
virtualenv/web/virtualenv_support/wheel-0.33.6-py2.py3-none-any.whl
web/tralalere/__init__.py
--- a/virtualenv/res/lib/lib_create_env.py	Tue Jan 21 22:11:51 2020 +0100
+++ b/virtualenv/res/lib/lib_create_env.py	Sat Jan 25 02:22:57 2020 +0100
@@ -50,10 +50,10 @@
     })
 else:
     URLS.update({
-        'PSYCOPG2': {'setup': 'psycopg2','url': 'http://www.psycopg.org/psycopg/tarballs/PSYCOPG-2-4/psycopg2-2.4.5.tar.gz', 'local':"psycopg2-2.4.5.tar.gz"},
+        'PSYCOPG2': {'setup': 'psycopg2','url': 'http://initd.org/psycopg/tarballs/PSYCOPG-2-8/psycopg2-2.8.4.tar.gz', 'local':"psycopg2-2.8.4.tar.gz"},
         'PYLUCENE': {'setup': 'pylucene', 'url': 'http://mirrors.ircam.fr/pub/apache/lucene/pylucene/pylucene-3.6.0-2-src.tar.gz', 'local':"pylucene-3.6.0-2-src.tar.gz"},
         'PIL': {'setup': 'pil', 'url': 'http://effbot.org/downloads/Imaging-1.1.7.tar.gz', 'local':"Imaging-1.1.7.tar.gz"},
-        'LXML': {'setup': 'lxml', 'url':"lxml-2.3.4.tar.bz2", 'local':"lxml-2.3.4.tar.bz2"}
+        'LXML': {'setup': 'lxml', 'url':"lxml-4.4.2.tar.gz", 'local':"lxml-4.4.2.tar.gz"}
     })
 
 
Binary file virtualenv/res/src/lxml-2.3.4.tar.bz2 has changed
Binary file virtualenv/res/src/lxml-4.4.2.tar.gz has changed
Binary file virtualenv/res/src/psycopg2-2.4.5.tar.gz has changed
Binary file virtualenv/res/src/psycopg2-2.8.4.tar.gz has changed
--- a/virtualenv/web/virtualenv.py	Tue Jan 21 22:11:51 2020 +0100
+++ b/virtualenv/web/virtualenv.py	Sat Jan 25 02:22:57 2020 +0100
@@ -1,253 +1,244 @@
 #!/usr/bin/env python
-"""Create a "virtual" Python installation
-"""
+"""Create a "virtual" Python installation"""
+
+# fmt: off
+import os  # isort:skip
+import sys  # isort:skip
+
+# If we are running in a new interpreter to create a virtualenv,
+# we do NOT want paths from our existing location interfering with anything,
+# So we remove this file's directory from sys.path - most likely to be
+# the previous interpreter's site-packages. Solves #705, #763, #779
+
 
-# If you change the version here, change it in setup.py
-# and docs/conf.py as well.
-virtualenv_version = "1.7.1.2"
+if os.environ.get("VIRTUALENV_INTERPRETER_RUNNING"):
+    for path in sys.path[:]:
+        if os.path.realpath(os.path.dirname(__file__)) == os.path.realpath(path):
+            sys.path.remove(path)
+# fmt: on
 
+import ast
 import base64
-import sys
+import codecs
+import contextlib
+import distutils.spawn
+import distutils.sysconfig
+import errno
+import glob
+import logging
+import optparse
 import os
-import optparse
 import re
 import shutil
-import logging
+import struct
+import subprocess
+import sys
 import tempfile
+import textwrap
+import zipfile
 import zlib
-import errno
-import distutils.sysconfig
 from distutils.util import strtobool
-
-try:
-    import subprocess
-except ImportError:
-    if sys.version_info <= (2, 3):
-        print('ERROR: %s' % sys.exc_info()[1])
-        print('ERROR: this script requires Python 2.4 or greater; or at least the subprocess module.')
-        print('If you copy subprocess.py from a newer version of Python this script will probably work')
-        sys.exit(101)
-    else:
-        raise
-try:
-    set
-except NameError:
-    from sets import Set as set
-try:
-    basestring
-except NameError:
-    basestring = str
+from os.path import join
 
 try:
     import ConfigParser
 except ImportError:
+    # noinspection PyPep8Naming
     import configparser as ConfigParser
 
-join = os.path.join
-py_version = 'python%s.%s' % (sys.version_info[0], sys.version_info[1])
+__version__ = "16.7.9"
+virtualenv_version = __version__  # legacy
+DEBUG = os.environ.get("_VIRTUALENV_DEBUG", None) == "1"
+if sys.version_info < (2, 7):
+    print("ERROR: {}".format(sys.exc_info()[1]))
+    print("ERROR: this script requires Python 2.7 or greater.")
+    sys.exit(101)
 
-is_jython = sys.platform.startswith('java')
-is_pypy = hasattr(sys, 'pypy_version_info')
-is_win  = (sys.platform == 'win32')
-abiflags = getattr(sys, 'abiflags', '')
+HERE = os.path.dirname(os.path.abspath(__file__))
+IS_ZIPAPP = os.path.isfile(HERE)
+
+try:
+    # noinspection PyUnresolvedReferences,PyUnboundLocalVariable
+    basestring
+except NameError:
+    basestring = str
+
+VERSION = "{}.{}".format(*sys.version_info)
+PY_VERSION = "python{}.{}".format(*sys.version_info)
 
-user_dir = os.path.expanduser('~')
-if sys.platform == 'win32':
-    user_dir = os.environ.get('APPDATA', user_dir)  # Use %APPDATA% for roaming
-    default_storage_dir = os.path.join(user_dir, 'virtualenv')
+IS_PYPY = hasattr(sys, "pypy_version_info")
+IS_WIN = sys.platform == "win32"
+IS_CYGWIN = sys.platform == "cygwin"
+IS_DARWIN = sys.platform == "darwin"
+ABI_FLAGS = getattr(sys, "abiflags", "")
+
+USER_DIR = os.path.expanduser("~")
+if IS_WIN:
+    DEFAULT_STORAGE_DIR = os.path.join(USER_DIR, "virtualenv")
 else:
-    default_storage_dir = os.path.join(user_dir, '.virtualenv')
-default_config_file = os.path.join(default_storage_dir, 'virtualenv.ini')
+    DEFAULT_STORAGE_DIR = os.path.join(USER_DIR, ".virtualenv")
+DEFAULT_CONFIG_FILE = os.path.join(DEFAULT_STORAGE_DIR, "virtualenv.ini")
 
-if is_pypy:
-    expected_exe = 'pypy'
-elif is_jython:
-    expected_exe = 'jython'
+if IS_PYPY:
+    EXPECTED_EXE = "pypy"
 else:
-    expected_exe = 'python'
+    EXPECTED_EXE = "python"
+
+# Return a mapping of version -> Python executable
+# Only provided for Windows, where the information in the registry is used
+if not IS_WIN:
+
+    def get_installed_pythons():
+        return {}
 
 
-REQUIRED_MODULES = ['os', 'posix', 'posixpath', 'nt', 'ntpath', 'genericpath',
-                    'fnmatch', 'locale', 'encodings', 'codecs',
-                    'stat', 'UserDict', 'readline', 'copy_reg', 'types',
-                    're', 'sre', 'sre_parse', 'sre_constants', 'sre_compile',
-                    'zlib']
+else:
+    try:
+        import winreg
+    except ImportError:
+        # noinspection PyUnresolvedReferences
+        import _winreg as winreg
+
+    def get_installed_pythons():
+        final_exes = dict()
 
-REQUIRED_FILES = ['lib-dynload', 'config']
+        # Grab exes from 32-bit registry view
+        exes = _get_installed_pythons_for_view("-32", winreg.KEY_WOW64_32KEY)
+        # Grab exes from 64-bit registry view
+        exes_64 = _get_installed_pythons_for_view("-64", winreg.KEY_WOW64_64KEY)
+        # Check if exes are unique
+        if set(exes.values()) != set(exes_64.values()):
+            exes.update(exes_64)
+
+        # Create dict with all versions found
+        for version, bitness in sorted(exes):
+            exe = exes[(version, bitness)]
+            # Add minor version (X.Y-32 or X.Y-64)
+            final_exes[version + bitness] = exe
+            # Add minor extensionless version (X.Y); 3.2-64 wins over 3.2-32
+            final_exes[version] = exe
+            # Add major version (X-32 or X-64)
+            final_exes[version[0] + bitness] = exe
+            # Add major extensionless version (X); 3.3-32 wins over 3.2-64
+            final_exes[version[0]] = exe
+
+        return final_exes
 
-majver, minver = sys.version_info[:2]
-if majver == 2:
-    if minver >= 6:
-        REQUIRED_MODULES.extend(['warnings', 'linecache', '_abcoll', 'abc'])
-    if minver >= 7:
-        REQUIRED_MODULES.extend(['_weakrefset'])
-    if minver <= 3:
-        REQUIRED_MODULES.extend(['sets', '__future__'])
-elif majver == 3:
+    def _get_installed_pythons_for_view(bitness, view):
+        exes = dict()
+        # If both system and current user installations are found for a
+        # particular Python version, the current user one is used
+        for key in (winreg.HKEY_LOCAL_MACHINE, winreg.HKEY_CURRENT_USER):
+            try:
+                python_core = winreg.OpenKey(key, "Software\\Python\\PythonCore", 0, view | winreg.KEY_READ)
+            except WindowsError:
+                # No registered Python installations
+                continue
+            i = 0
+            while True:
+                try:
+                    version = winreg.EnumKey(python_core, i)
+                    i += 1
+                    try:
+                        at_path = winreg.QueryValue(python_core, "{}\\InstallPath".format(version))
+                    except WindowsError:
+                        continue
+                    # Remove bitness from version
+                    if version.endswith(bitness):
+                        version = version[: -len(bitness)]
+                    exes[(version, bitness)] = join(at_path, "python.exe")
+                except WindowsError:
+                    break
+            winreg.CloseKey(python_core)
+
+        return exes
+
+
+REQUIRED_MODULES = [
+    "os",
+    "posix",
+    "posixpath",
+    "nt",
+    "ntpath",
+    "genericpath",
+    "fnmatch",
+    "locale",
+    "encodings",
+    "codecs",
+    "stat",
+    "UserDict",
+    "readline",
+    "copy_reg",
+    "types",
+    "re",
+    "sre",
+    "sre_parse",
+    "sre_constants",
+    "sre_compile",
+    "zlib",
+]
+
+REQUIRED_FILES = ["lib-dynload", "config"]
+
+MAJOR, MINOR = sys.version_info[:2]
+if MAJOR == 2:
+    if MINOR >= 6:
+        REQUIRED_MODULES.extend(["warnings", "linecache", "_abcoll", "abc"])
+    if MINOR >= 7:
+        REQUIRED_MODULES.extend(["_weakrefset"])
+elif MAJOR == 3:
     # Some extra modules are needed for Python 3, but different ones
     # for different versions.
-    REQUIRED_MODULES.extend(['_abcoll', 'warnings', 'linecache', 'abc', 'io',
-                             '_weakrefset', 'copyreg', 'tempfile', 'random',
-                             '__future__', 'collections', 'keyword', 'tarfile',
-                             'shutil', 'struct', 'copy'])
-    if minver >= 2:
-        REQUIRED_FILES[-1] = 'config-%s' % majver
-    if minver == 3:
-        # The whole list of 3.3 modules is reproduced below - the current
-        # uncommented ones are required for 3.3 as of now, but more may be
-        # added as 3.3 development continues.
-        REQUIRED_MODULES.extend([
-            #"aifc",
-            #"antigravity",
-            #"argparse",
-            #"ast",
-            #"asynchat",
-            #"asyncore",
-            "base64",
-            #"bdb",
-            #"binhex",
-            "bisect",
-            #"calendar",
-            #"cgi",
-            #"cgitb",
-            #"chunk",
-            #"cmd",
-            #"codeop",
-            #"code",
-            #"colorsys",
-            #"_compat_pickle",
-            #"compileall",
-            #"concurrent",
-            #"configparser",
-            #"contextlib",
-            #"cProfile",
-            #"crypt",
-            #"csv",
-            #"ctypes",
-            #"curses",
-            #"datetime",
-            #"dbm",
-            #"decimal",
-            #"difflib",
-            #"dis",
-            #"doctest",
-            #"dummy_threading",
-            "_dummy_thread",
-            #"email",
-            #"filecmp",
-            #"fileinput",
-            #"formatter",
-            #"fractions",
-            #"ftplib",
-            #"functools",
-            #"getopt",
-            #"getpass",
-            #"gettext",
-            #"glob",
-            #"gzip",
-            "hashlib",
+    REQUIRED_MODULES.extend(
+        [
+            "_abcoll",
+            "warnings",
+            "linecache",
+            "abc",
+            "io",
+            "_weakrefset",
+            "copyreg",
+            "tempfile",
+            "random",
+            "__future__",
+            "collections",
+            "keyword",
+            "tarfile",
+            "shutil",
+            "struct",
+            "copy",
+            "tokenize",
+            "token",
+            "functools",
             "heapq",
-            "hmac",
-            #"html",
-            #"http",
-            #"idlelib",
-            #"imaplib",
-            #"imghdr",
-            #"importlib",
-            #"inspect",
-            #"json",
-            #"lib2to3",
-            #"logging",
-            #"macpath",
-            #"macurl2path",
-            #"mailbox",
-            #"mailcap",
-            #"_markupbase",
-            #"mimetypes",
-            #"modulefinder",
-            #"multiprocessing",
-            #"netrc",
-            #"nntplib",
-            #"nturl2path",
-            #"numbers",
-            #"opcode",
-            #"optparse",
-            #"os2emxpath",
-            #"pdb",
-            #"pickle",
-            #"pickletools",
-            #"pipes",
-            #"pkgutil",
-            #"platform",
-            #"plat-linux2",
-            #"plistlib",
-            #"poplib",
-            #"pprint",
-            #"profile",
-            #"pstats",
-            #"pty",
-            #"pyclbr",
-            #"py_compile",
-            #"pydoc_data",
-            #"pydoc",
-            #"_pyio",
-            #"queue",
-            #"quopri",
+            "bisect",
+            "weakref",
             "reprlib",
-            "rlcompleter",
-            #"runpy",
-            #"sched",
-            #"shelve",
-            #"shlex",
-            #"smtpd",
-            #"smtplib",
-            #"sndhdr",
-            #"socket",
-            #"socketserver",
-            #"sqlite3",
-            #"ssl",
-            #"stringprep",
-            #"string",
-            #"_strptime",
-            #"subprocess",
-            #"sunau",
-            #"symbol",
-            #"symtable",
-            #"sysconfig",
-            #"tabnanny",
-            #"telnetlib",
-            #"test",
-            #"textwrap",
-            #"this",
-            #"_threading_local",
-            #"threading",
-            #"timeit",
-            #"tkinter",
-            #"tokenize",
-            #"token",
-            #"traceback",
-            #"trace",
-            #"tty",
-            #"turtledemo",
-            #"turtle",
-            #"unittest",
-            #"urllib",
-            #"uuid",
-            #"uu",
-            #"wave",
-            "weakref",
-            #"webbrowser",
-            #"wsgiref",
-            #"xdrlib",
-            #"xml",
-            #"xmlrpc",
-            #"zipfile",
-        ])
+        ]
+    )
+    if MINOR >= 2:
+        REQUIRED_FILES[-1] = "config-{}".format(MAJOR)
+    if MINOR >= 3:
+        import sysconfig
 
-if is_pypy:
+        platform_dir = sysconfig.get_config_var("PLATDIR")
+        REQUIRED_FILES.append(platform_dir)
+        REQUIRED_MODULES.extend(["base64", "_dummy_thread", "hashlib", "hmac", "imp", "importlib", "rlcompleter"])
+    if MINOR >= 4:
+        REQUIRED_MODULES.extend(["operator", "_collections_abc", "_bootlocale"])
+    if MINOR >= 6:
+        REQUIRED_MODULES.extend(["enum"])
+
+if IS_PYPY:
     # these are needed to correctly display the exceptions that may happen
     # during the bootstrap
-    REQUIRED_MODULES.extend(['traceback', 'linecache'])
+    REQUIRED_MODULES.extend(["traceback", "linecache"])
+
+    if MAJOR == 3:
+        # _functools is needed to import locale during stdio initialization and
+        # needs to be copied on PyPy because it's not built in
+        REQUIRED_MODULES.append("_functools")
+
 
 class Logger(object):
 
@@ -258,7 +249,7 @@
 
     DEBUG = logging.DEBUG
     INFO = logging.INFO
-    NOTIFY = (logging.INFO+logging.WARN)/2
+    NOTIFY = (logging.INFO + logging.WARN) / 2
     WARN = WARNING = logging.WARN
     ERROR = logging.ERROR
     FATAL = logging.FATAL
@@ -273,63 +264,66 @@
 
     def debug(self, msg, *args, **kw):
         self.log(self.DEBUG, msg, *args, **kw)
+
     def info(self, msg, *args, **kw):
         self.log(self.INFO, msg, *args, **kw)
+
     def notify(self, msg, *args, **kw):
         self.log(self.NOTIFY, msg, *args, **kw)
+
     def warn(self, msg, *args, **kw):
         self.log(self.WARN, msg, *args, **kw)
+
     def error(self, msg, *args, **kw):
-        self.log(self.WARN, msg, *args, **kw)
+        self.log(self.ERROR, msg, *args, **kw)
+
     def fatal(self, msg, *args, **kw):
         self.log(self.FATAL, msg, *args, **kw)
+
     def log(self, level, msg, *args, **kw):
         if args:
             if kw:
-                raise TypeError(
-                    "You may give positional or keyword arguments, not both")
+                raise TypeError("You may give positional or keyword arguments, not both")
         args = args or kw
         rendered = None
         for consumer_level, consumer in self.consumers:
             if self.level_matches(level, consumer_level):
-                if (self.in_progress_hanging
-                    and consumer in (sys.stdout, sys.stderr)):
+                if self.in_progress_hanging and consumer in (sys.stdout, sys.stderr):
                     self.in_progress_hanging = False
-                    sys.stdout.write('\n')
+                    print("")
                     sys.stdout.flush()
                 if rendered is None:
                     if args:
                         rendered = msg % args
                     else:
                         rendered = msg
-                    rendered = ' '*self.indent + rendered
-                if hasattr(consumer, 'write'):
-                    consumer.write(rendered+'\n')
+                    rendered = " " * self.indent + rendered
+                if hasattr(consumer, "write"):
+                    consumer.write(rendered + "\n")
                 else:
                     consumer(rendered)
 
     def start_progress(self, msg):
-        assert not self.in_progress, (
-            "Tried to start_progress(%r) while in_progress %r"
-            % (msg, self.in_progress))
+        assert not self.in_progress, "Tried to start_progress({!r}) while in_progress {!r}".format(
+            msg, self.in_progress
+        )
         if self.level_matches(self.NOTIFY, self._stdout_level()):
-            sys.stdout.write(msg)
+            print(msg)
             sys.stdout.flush()
             self.in_progress_hanging = True
         else:
             self.in_progress_hanging = False
         self.in_progress = msg
 
-    def end_progress(self, msg='done.'):
-        assert self.in_progress, (
-            "Tried to end_progress without start_progress")
+    def end_progress(self, msg="done."):
+        assert self.in_progress, "Tried to end_progress without start_progress"
         if self.stdout_level_matches(self.NOTIFY):
             if not self.in_progress_hanging:
                 # Some message has been printed out since start_progress
-                sys.stdout.write('...' + self.in_progress + msg + '\n')
+                print("...{}{}".format(self.in_progress, msg))
                 sys.stdout.flush()
             else:
-                sys.stdout.write(msg + '\n')
+                print(msg)
                 sys.stdout.flush()
         self.in_progress = None
         self.in_progress_hanging = False
@@ -338,7 +332,7 @@
         """If we are in a progress scope, and no log messages have been
         shown, write out another '.'"""
         if self.in_progress_hanging:
-            sys.stdout.write('.')
+            print(".")
             sys.stdout.flush()
 
     def stdout_level_matches(self, level):
@@ -352,7 +346,8 @@
                 return level
         return self.FATAL
 
-    def level_matches(self, level, consumer_level):
+    @staticmethod
+    def level_matches(level, consumer_level):
         """
         >>> l = Logger([])
         >>> l.level_matches(3, 4)
@@ -378,7 +373,7 @@
         else:
             return level >= consumer_level
 
-    #@classmethod
+    @classmethod
     def level_for_integer(cls, level):
         levels = cls.LEVELS
         if level < 0:
@@ -387,279 +382,123 @@
             return levels[-1]
         return levels[level]
 
-    level_for_integer = classmethod(level_for_integer)
 
 # create a silent logger just to prevent this from being undefined
 # will be overridden with requested verbosity main() is called.
 logger = Logger([(Logger.LEVELS[-1], sys.stdout)])
 
-def mkdir(path):
-    if not os.path.exists(path):
-        logger.info('Creating %s', path)
-        os.makedirs(path)
+
+def mkdir(at_path):
+    if not os.path.exists(at_path):
+        logger.info("Creating %s", at_path)
+        os.makedirs(at_path)
     else:
-        logger.info('Directory %s already exists', path)
+        logger.info("Directory %s already exists", at_path)
+
 
-def copyfileordir(src, dest):
+def copy_file_or_folder(src, dest, symlink=True):
     if os.path.isdir(src):
-        shutil.copytree(src, dest, True)
+        shutil.copytree(src, dest, symlink)
     else:
         shutil.copy2(src, dest)
 
+
 def copyfile(src, dest, symlink=True):
     if not os.path.exists(src):
         # Some bad symlink in the src
-        logger.warn('Cannot find file %s (bad symlink)', src)
+        logger.warn("Cannot find file %s (bad symlink)", src)
         return
     if os.path.exists(dest):
-        logger.debug('File %s already exists', dest)
+        logger.debug("File %s already exists", dest)
         return
     if not os.path.exists(os.path.dirname(dest)):
-        logger.info('Creating parent directories for %s' % os.path.dirname(dest))
+        logger.info("Creating parent directories for %s", os.path.dirname(dest))
         os.makedirs(os.path.dirname(dest))
-    if not os.path.islink(src):
-        srcpath = os.path.abspath(src)
+    if symlink and hasattr(os, "symlink") and not IS_WIN:
+        logger.info("Symlinking %s", dest)
+        try:
+            os.symlink(os.path.realpath(src), dest)
+        except (OSError, NotImplementedError):
+            logger.info("Symlinking failed, copying to %s", dest)
+            copy_file_or_folder(src, dest, symlink)
     else:
-        srcpath = os.readlink(src)
-    if symlink and hasattr(os, 'symlink') and not is_win:
-        logger.info('Symlinking %s', dest)
-        try:
-            os.symlink(srcpath, dest)
-        except (OSError, NotImplementedError):
-            logger.info('Symlinking failed, copying to %s', dest)
-            copyfileordir(src, dest)
-    else:
-        logger.info('Copying to %s', dest)
-        copyfileordir(src, dest)
+        logger.info("Copying to %s", dest)
+        copy_file_or_folder(src, dest, symlink)
+
 
 def writefile(dest, content, overwrite=True):
     if not os.path.exists(dest):
-        logger.info('Writing %s', dest)
-        f = open(dest, 'wb')
-        f.write(content.encode('utf-8'))
-        f.close()
+        logger.info("Writing %s", dest)
+        with open(dest, "wb") as f:
+            f.write(content.encode("utf-8"))
         return
     else:
-        f = open(dest, 'rb')
-        c = f.read()
-        f.close()
-        if c != content:
+        with open(dest, "rb") as f:
+            c = f.read()
+        if c != content.encode("utf-8"):
             if not overwrite:
-                logger.notify('File %s exists with different content; not overwriting', dest)
+                logger.notify("File %s exists with different content; not overwriting", dest)
                 return
-            logger.notify('Overwriting %s with new content', dest)
-            f = open(dest, 'wb')
-            f.write(content.encode('utf-8'))
-            f.close()
+            logger.notify("Overwriting %s with new content", dest)
+            with open(dest, "wb") as f:
+                f.write(content.encode("utf-8"))
         else:
-            logger.info('Content %s already in place', dest)
+            logger.info("Content %s already in place", dest)
+
 
-def rmtree(dir):
-    if os.path.exists(dir):
-        logger.notify('Deleting tree %s', dir)
-        shutil.rmtree(dir)
+def rm_tree(folder):
+    if os.path.exists(folder):
+        logger.notify("Deleting tree %s", folder)
+        shutil.rmtree(folder)
     else:
-        logger.info('Do not need to delete %s; already gone', dir)
+        logger.info("Do not need to delete %s; already gone", folder)
+
 
 def make_exe(fn):
-    if hasattr(os, 'chmod'):
-        oldmode = os.stat(fn).st_mode & 0xFFF # 0o7777
-        newmode = (oldmode | 0x16D) & 0xFFF # 0o555, 0o7777
-        os.chmod(fn, newmode)
-        logger.info('Changed mode of %s to %s', fn, oct(newmode))
+    if hasattr(os, "chmod"):
+        old_mode = os.stat(fn).st_mode & 0xFFF  # 0o7777
+        new_mode = (old_mode | 0x16D) & 0xFFF  # 0o555, 0o7777
+        os.chmod(fn, new_mode)
+        logger.info("Changed mode of %s to %s", fn, oct(new_mode))
 
-def _find_file(filename, dirs):
-    for dir in reversed(dirs):
-        if os.path.exists(join(dir, filename)):
-            return join(dir, filename)
-    return filename
-
-def _install_req(py_executable, unzip=False, distribute=False,
-                 search_dirs=None, never_download=False):
-
-    if search_dirs is None:
-        search_dirs = file_search_dirs()
 
-    if not distribute:
-        setup_fn = 'setuptools-0.6c11-py%s.egg' % sys.version[:3]
-        project_name = 'setuptools'
-        bootstrap_script = EZ_SETUP_PY
-        source = None
-    else:
-        setup_fn = None
-        source = 'distribute-0.6.24.tar.gz'
-        project_name = 'distribute'
-        bootstrap_script = DISTRIBUTE_SETUP_PY
-
-    if setup_fn is not None:
-        setup_fn = _find_file(setup_fn, search_dirs)
+def _find_file(filename, folders):
+    for folder in reversed(folders):
+        files = glob.glob(os.path.join(folder, filename))
+        if files and os.path.isfile(files[0]):
+            return True, files[0]
+    return False, filename
 
-    if source is not None:
-        source = _find_file(source, search_dirs)
-
-    if is_jython and os._name == 'nt':
-        # Jython's .bat sys.executable can't handle a command line
-        # argument with newlines
-        fd, ez_setup = tempfile.mkstemp('.py')
-        os.write(fd, bootstrap_script)
-        os.close(fd)
-        cmd = [py_executable, ez_setup]
-    else:
-        cmd = [py_executable, '-c', bootstrap_script]
-    if unzip:
-        cmd.append('--always-unzip')
-    env = {}
-    remove_from_env = []
-    if logger.stdout_level_matches(logger.DEBUG):
-        cmd.append('-v')
 
-    old_chdir = os.getcwd()
-    if setup_fn is not None and os.path.exists(setup_fn):
-        logger.info('Using existing %s egg: %s' % (project_name, setup_fn))
-        cmd.append(setup_fn)
-        if os.environ.get('PYTHONPATH'):
-            env['PYTHONPATH'] = setup_fn + os.path.pathsep + os.environ['PYTHONPATH']
-        else:
-            env['PYTHONPATH'] = setup_fn
-    else:
-        # the source is found, let's chdir
-        if source is not None and os.path.exists(source):
-            logger.info('Using existing %s egg: %s' % (project_name, source))
-            os.chdir(os.path.dirname(source))
-            # in this case, we want to be sure that PYTHONPATH is unset (not
-            # just empty, really unset), else CPython tries to import the
-            # site.py that it's in virtualenv_support
-            remove_from_env.append('PYTHONPATH')
-        else:
-            if never_download:
-                logger.fatal("Can't find any local distributions of %s to install "
-                             "and --never-download is set.  Either re-run virtualenv "
-                             "without the --never-download option, or place a %s "
-                             "distribution (%s) in one of these "
-                             "locations: %r" % (project_name, project_name,
-                                                setup_fn or source,
-                                                search_dirs))
-                sys.exit(1)
+@contextlib.contextmanager
+def virtualenv_support_dirs():
+    """Context manager yielding either [virtualenv_support_dir] or []"""
 
-            logger.info('No %s egg found; downloading' % project_name)
-        cmd.extend(['--always-copy', '-U', project_name])
-    logger.start_progress('Installing %s...' % project_name)
-    logger.indent += 2
-    cwd = None
-    if project_name == 'distribute':
-        env['DONT_PATCH_SETUPTOOLS'] = 'true'
-
-    def _filter_ez_setup(line):
-        return filter_ez_setup(line, project_name)
-
-    if not os.access(os.getcwd(), os.W_OK):
-        cwd = tempfile.mkdtemp()
-        if source is not None and os.path.exists(source):
-            # the current working dir is hostile, let's copy the
-            # tarball to a temp dir
-            target = os.path.join(cwd, os.path.split(source)[-1])
-            shutil.copy(source, target)
-    try:
-        call_subprocess(cmd, show_stdout=False,
-                        filter_stdout=_filter_ez_setup,
-                        extra_env=env,
-                        remove_from_env=remove_from_env,
-                        cwd=cwd)
-    finally:
-        logger.indent -= 2
-        logger.end_progress()
-        if os.getcwd() != old_chdir:
-            os.chdir(old_chdir)
-        if is_jython and os._name == 'nt':
-            os.remove(ez_setup)
-
-def file_search_dirs():
-    here = os.path.dirname(os.path.abspath(__file__))
-    dirs = ['.', here,
-            join(here, 'virtualenv_support')]
-    if os.path.splitext(os.path.dirname(__file__))[0] != 'virtualenv':
-        # Probably some boot script; just in case virtualenv is installed...
+    # normal filesystem installation
+    if os.path.isdir(join(HERE, "virtualenv_support")):
+        yield [join(HERE, "virtualenv_support")]
+    elif IS_ZIPAPP:
+        tmpdir = tempfile.mkdtemp()
         try:
+            with zipfile.ZipFile(HERE) as zipf:
+                for member in zipf.namelist():
+                    if os.path.dirname(member) == "virtualenv_support":
+                        zipf.extract(member, tmpdir)
+            yield [join(tmpdir, "virtualenv_support")]
+        finally:
+            shutil.rmtree(tmpdir)
+    # probably a bootstrap script
+    elif os.path.splitext(os.path.dirname(__file__))[0] != "virtualenv":
+        try:
+            # noinspection PyUnresolvedReferences
             import virtualenv
         except ImportError:
-            pass
+            yield []
         else:
-            dirs.append(os.path.join(os.path.dirname(virtualenv.__file__), 'virtualenv_support'))
-    return [d for d in dirs if os.path.isdir(d)]
-
-def install_setuptools(py_executable, unzip=False,
-                       search_dirs=None, never_download=False):
-    _install_req(py_executable, unzip,
-                 search_dirs=search_dirs, never_download=never_download)
-
-def install_distribute(py_executable, unzip=False,
-                       search_dirs=None, never_download=False):
-    _install_req(py_executable, unzip, distribute=True,
-                 search_dirs=search_dirs, never_download=never_download)
-
-_pip_re = re.compile(r'^pip-.*(zip|tar.gz|tar.bz2|tgz|tbz)$', re.I)
-def install_pip(py_executable, search_dirs=None, never_download=False):
-    if search_dirs is None:
-        search_dirs = file_search_dirs()
-
-    filenames = []
-    for dir in search_dirs:
-        filenames.extend([join(dir, fn) for fn in os.listdir(dir)
-                          if _pip_re.search(fn)])
-    filenames = [(os.path.basename(filename).lower(), i, filename) for i, filename in enumerate(filenames)]
-    filenames.sort()
-    filenames = [filename for basename, i, filename in filenames]
-    if not filenames:
-        filename = 'pip'
+            yield [join(os.path.dirname(virtualenv.__file__), "virtualenv_support")]
+    # we tried!
     else:
-        filename = filenames[-1]
-    easy_install_script = 'easy_install'
-    if sys.platform == 'win32':
-        easy_install_script = 'easy_install-script.py'
-    cmd = [join(os.path.dirname(py_executable), easy_install_script), filename]
-    if sys.platform == 'win32':
-        cmd.insert(0, py_executable)
-    if filename == 'pip':
-        if never_download:
-            logger.fatal("Can't find any local distributions of pip to install "
-                         "and --never-download is set.  Either re-run virtualenv "
-                         "without the --never-download option, or place a pip "
-                         "source distribution (zip/tar.gz/tar.bz2) in one of these "
-                         "locations: %r" % search_dirs)
-            sys.exit(1)
-        logger.info('Installing pip from network...')
-    else:
-        logger.info('Installing existing %s distribution: %s' % (
-                os.path.basename(filename), filename))
-    logger.start_progress('Installing pip...')
-    logger.indent += 2
-    def _filter_setup(line):
-        return filter_ez_setup(line, 'pip')
-    try:
-        call_subprocess(cmd, show_stdout=False,
-                        filter_stdout=_filter_setup)
-    finally:
-        logger.indent -= 2
-        logger.end_progress()
-
-def filter_ez_setup(line, project_name='setuptools'):
-    if not line.strip():
-        return Logger.DEBUG
-    if project_name == 'distribute':
-        for prefix in ('Extracting', 'Now working', 'Installing', 'Before',
-                       'Scanning', 'Setuptools', 'Egg', 'Already',
-                       'running', 'writing', 'reading', 'installing',
-                       'creating', 'copying', 'byte-compiling', 'removing',
-                       'Processing'):
-            if line.startswith(prefix):
-                return Logger.DEBUG
-        return Logger.DEBUG
-    for prefix in ['Reading ', 'Best match', 'Processing setuptools',
-                   'Copying setuptools', 'Adding setuptools',
-                   'Installing ', 'Installed ']:
-        if line.startswith(prefix):
-            return Logger.DEBUG
-    return Logger.INFO
+        yield []
 
 
 class UpdatingDefaultsHelpFormatter(optparse.IndentedHelpFormatter):
@@ -668,6 +507,7 @@
     the defaults before expanding them, allowing them to show up correctly
     in the help listing
     """
+
     def expand_default(self, option):
         if self.parser is not None:
             self.parser.update_defaults(self.parser.defaults)
@@ -676,20 +516,22 @@
 
 class ConfigOptionParser(optparse.OptionParser):
     """
-    Custom option parser which updates its defaults by by checking the
+    Custom option parser which updates its defaults by checking the
     configuration files and environmental variables
     """
+
     def __init__(self, *args, **kwargs):
         self.config = ConfigParser.RawConfigParser()
         self.files = self.get_config_files()
         self.config.read(self.files)
         optparse.OptionParser.__init__(self, *args, **kwargs)
 
-    def get_config_files(self):
-        config_file = os.environ.get('VIRTUALENV_CONFIG_FILE', False)
+    @staticmethod
+    def get_config_files():
+        config_file = os.environ.get("VIRTUALENV_CONFIG_FILE", False)
         if config_file and os.path.exists(config_file):
             return [config_file]
-        return [default_config_file]
+        return [DEFAULT_CONFIG_FILE]
 
     def update_defaults(self, defaults):
         """
@@ -700,31 +542,33 @@
         # Then go and look for the other sources of configuration:
         config = {}
         # 1. config files
-        config.update(dict(self.get_config_section('virtualenv')))
+        config.update(dict(self.get_config_section("virtualenv")))
         # 2. environmental variables
         config.update(dict(self.get_environ_vars()))
         # Then set the options with those values
         for key, val in config.items():
-            key = key.replace('_', '-')
-            if not key.startswith('--'):
-                key = '--%s' % key  # only prefer long opts
+            key = key.replace("_", "-")
+            if not key.startswith("--"):
+                key = "--{}".format(key)  # only prefer long opts
             option = self.get_option(key)
             if option is not None:
                 # ignore empty values
                 if not val:
                     continue
                 # handle multiline configs
-                if option.action == 'append':
+                if option.action == "append":
                     val = val.split()
                 else:
                     option.nargs = 1
-                if option.action in ('store_true', 'store_false', 'count'):
+                if option.action == "store_false":
+                    val = not strtobool(val)
+                elif option.action in ("store_true", "count"):
                     val = strtobool(val)
                 try:
                     val = option.convert_value(key, val)
                 except optparse.OptionValueError:
                     e = sys.exc_info()[1]
-                    print("An error occured during configuration: %s" % e)
+                    print("An error occurred during configuration: {!r}".format(e))
                     sys.exit(3)
                 defaults[option.dest] = val
         return defaults
@@ -737,24 +581,24 @@
             return self.config.items(name)
         return []
 
-    def get_environ_vars(self, prefix='VIRTUALENV_'):
+    def get_environ_vars(self, prefix="VIRTUALENV_"):
         """
         Returns a generator with all environmental vars with prefix VIRTUALENV
         """
         for key, val in os.environ.items():
             if key.startswith(prefix):
-                yield (key.replace(prefix, '').lower(), val)
+                yield (key.replace(prefix, "").lower(), val)
 
     def get_default_values(self):
         """
-        Overridding to make updating the defaults after instantiation of
+        Overriding to make updating the defaults after instantiation of
         the option parser possible, update_defaults() does the dirty work.
         """
         if not self.process_default_values:
             # Old, pre-Optik 1.5 behaviour.
             return optparse.Values(self.defaults)
 
-        defaults = self.update_defaults(self.defaults.copy()) # ours
+        defaults = self.update_defaults(self.defaults.copy())  # ours
         for option in self._get_all_options():
             default = defaults.get(option.dest)
             if isinstance(default, basestring):
@@ -765,254 +609,544 @@
 
 def main():
     parser = ConfigOptionParser(
-        version=virtualenv_version,
-        usage="%prog [OPTIONS] DEST_DIR",
-        formatter=UpdatingDefaultsHelpFormatter())
+        version=virtualenv_version, usage="%prog [OPTIONS] DEST_DIR", formatter=UpdatingDefaultsHelpFormatter()
+    )
 
     parser.add_option(
-        '-v', '--verbose',
-        action='count',
-        dest='verbose',
-        default=0,
-        help="Increase verbosity")
+        "-v", "--verbose", action="count", dest="verbose", default=5 if DEBUG else 0, help="Increase verbosity."
+    )
+
+    parser.add_option("-q", "--quiet", action="count", dest="quiet", default=0, help="Decrease verbosity.")
 
     parser.add_option(
-        '-q', '--quiet',
-        action='count',
-        dest='quiet',
-        default=0,
-        help='Decrease verbosity')
+        "-p",
+        "--python",
+        dest="python",
+        metavar="PYTHON_EXE",
+        help="The Python interpreter to use, e.g., --python=python3.5 will use the python3.5 "
+        "interpreter to create the new environment.  The default is the interpreter that "
+        "virtualenv was installed with ({})".format(sys.executable),
+    )
 
     parser.add_option(
-        '-p', '--python',
-        dest='python',
-        metavar='PYTHON_EXE',
-        help='The Python interpreter to use, e.g., --python=python2.5 will use the python2.5 '
-        'interpreter to create the new environment.  The default is the interpreter that '
-        'virtualenv was installed with (%s)' % sys.executable)
+        "--clear", dest="clear", action="store_true", help="Clear out the non-root install and start from scratch."
+    )
+
+    parser.set_defaults(system_site_packages=False)
+    parser.add_option(
+        "--no-site-packages",
+        dest="system_site_packages",
+        action="store_false",
+        help="DEPRECATED. Retained only for backward compatibility. "
+        "Not having access to global site-packages is now the default behavior.",
+    )
 
     parser.add_option(
-        '--clear',
-        dest='clear',
-        action='store_true',
-        help="Clear out the non-root install and start from scratch")
+        "--system-site-packages",
+        dest="system_site_packages",
+        action="store_true",
+        help="Give the virtual environment access to the global site-packages.",
+    )
 
     parser.add_option(
-        '--no-site-packages',
-        dest='no_site_packages',
-        action='store_true',
-        help="Don't give access to the global site-packages dir to the "
-             "virtual environment")
+        "--always-copy",
+        dest="symlink",
+        action="store_false",
+        default=True,
+        help="Always copy files rather than symlinking.",
+    )
+
+    parser.add_option(
+        "--relocatable",
+        dest="relocatable",
+        action="store_true",
+        help="Make an EXISTING virtualenv environment relocatable. "
+        "This fixes up scripts and makes all .pth files relative.",
+    )
 
     parser.add_option(
-        '--system-site-packages',
-        dest='system_site_packages',
-        action='store_true',
-        help="Give access to the global site-packages dir to the "
-             "virtual environment")
+        "--no-setuptools",
+        dest="no_setuptools",
+        action="store_true",
+        help="Do not install setuptools in the new virtualenv.",
+    )
+
+    parser.add_option("--no-pip", dest="no_pip", action="store_true", help="Do not install pip in the new virtualenv.")
+
+    parser.add_option(
+        "--no-wheel", dest="no_wheel", action="store_true", help="Do not install wheel in the new virtualenv."
+    )
 
     parser.add_option(
-        '--unzip-setuptools',
-        dest='unzip_setuptools',
-        action='store_true',
-        help="Unzip Setuptools or Distribute when installing it")
+        "--extra-search-dir",
+        dest="search_dirs",
+        action="append",
+        metavar="DIR",
+        default=[],
+        help="Directory to look for setuptools/pip distributions in. " "This option can be used multiple times.",
+    )
 
     parser.add_option(
-        '--relocatable',
-        dest='relocatable',
-        action='store_true',
-        help='Make an EXISTING virtualenv environment relocatable.  '
-        'This fixes up scripts and makes all .pth files relative')
+        "--download",
+        dest="download",
+        default=True,
+        action="store_true",
+        help="Download pre-installed packages from PyPI.",
+    )
 
     parser.add_option(
-        '--distribute',
-        dest='use_distribute',
-        action='store_true',
-        help='Use Distribute instead of Setuptools. Set environ variable '
-        'VIRTUALENV_DISTRIBUTE to make it the default ')
+        "--no-download",
+        "--never-download",
+        dest="download",
+        action="store_false",
+        help="Do not download pre-installed packages from PyPI.",
+    )
 
-    default_search_dirs = file_search_dirs()
-    parser.add_option(
-        '--extra-search-dir',
-        dest="search_dirs",
-        action="append",
-        default=default_search_dirs,
-        help="Directory to look for setuptools/distribute/pip distributions in. "
-        "You can add any number of additional --extra-search-dir paths.")
+    parser.add_option("--prompt", dest="prompt", help="Provides an alternative prompt prefix for this environment.")
 
     parser.add_option(
-        '--never-download',
-        dest="never_download",
+        "--setuptools",
+        dest="setuptools",
         action="store_true",
-        help="Never download anything from the network.  Instead, virtualenv will fail "
-        "if local distributions of setuptools/distribute/pip are not present.")
+        help="DEPRECATED. Retained only for backward compatibility. This option has no effect.",
+    )
 
     parser.add_option(
-        '--prompt=',
-        dest='prompt',
-        help='Provides an alternative prompt prefix for this environment')
+        "--distribute",
+        dest="distribute",
+        action="store_true",
+        help="DEPRECATED. Retained only for backward compatibility. This option has no effect.",
+    )
 
-    if 'extend_parser' in globals():
-        extend_parser(parser)
+    parser.add_option(
+        "--unzip-setuptools",
+        action="store_true",
+        help="DEPRECATED.  Retained only for backward compatibility. This option has no effect.",
+    )
+
+    if "extend_parser" in globals():
+        # noinspection PyUnresolvedReferences
+        extend_parser(parser)  # noqa: F821
 
     options, args = parser.parse_args()
 
     global logger
 
-    if 'adjust_options' in globals():
-        adjust_options(options, args)
+    if "adjust_options" in globals():
+        # noinspection PyUnresolvedReferences
+        adjust_options(options, args)  # noqa: F821
 
     verbosity = options.verbose - options.quiet
-    logger = Logger([(Logger.level_for_integer(2-verbosity), sys.stdout)])
+    logger = Logger([(Logger.level_for_integer(2 - verbosity), sys.stdout)])
+
+    def should_reinvoke(options):
+        """Do we need to reinvoke ourself?"""
+        # Did the user specify the --python option?
+        if options.python and not os.environ.get("VIRTUALENV_INTERPRETER_RUNNING"):
+            interpreter = resolve_interpreter(options.python)
+            if interpreter != sys.executable:
+                # The user specified a different interpreter, so we have to reinvoke.
+                return interpreter
 
-    if options.python and not os.environ.get('VIRTUALENV_INTERPRETER_RUNNING'):
+        # At this point, we know the user wants to use sys.executable to create the
+        # virtual environment. But on Windows, sys.executable may be a venv redirector,
+        # in which case we still need to locate the underlying actual interpreter, and
+        # reinvoke using that.
+        if IS_WIN:
+            # OK. Now things get really fun...
+            #
+            # If we are running from a venv, with a redirector, then what happens is as
+            # follows:
+            #
+            #   1. The redirector sets __PYVENV_LAUNCHER__ in the environment to point
+            #      to the redirector executable.
+            #   2. The redirector launches the "base" Python (from the home value in
+            #      pyvenv.cfg).
+            #   3. The base Python executable sees __PYVENV_LAUNCHER__ in the environment
+            #      and sets sys.executable to that value.
+            #   4. If site.py gets run, it sees __PYVENV_LAUNCHER__, and sets
+            #      sys._base_executable to _winapi.GetModuleFileName(0) and removes
+            #      __PYVENV_LAUNCHER__.
+            #
+            # Unfortunately, that final step (site.py) may not happen. There are 2 key
+            # times when that is the case:
+            #
+            #   1. Python 3.7.2, which had the redirector but not the site.py code.
+            #   2. Running a venv from a virtualenv, which uses virtualenv's custom
+            #      site.py.
+            #
+            # So, we check for sys._base_executable, but if it's not present and yet we
+            # have __PYVENV_LAUNCHER__, we do what site.py would have done and get our
+            # interpreter from GetModuleFileName(0). We also remove __PYVENV_LAUNCHER__
+            # from the environment, to avoid loops (actually, mainly because site.py
+            # does so, and my head hurts enough buy now that I just want to be safe!)
+
+            # In Python 3.7.4, the rules changed so that sys._base_executable is always
+            # set. So we now only return sys._base_executable if it's set *and does not
+            # match sys.executable* (we still have to check that it's set, as we need to
+            # support Python 3.7.3 and earlier).
+
+            # Phew.
+
+            if getattr(sys, "_base_executable", sys.executable) != sys.executable:
+                return sys._base_executable
+
+            if "__PYVENV_LAUNCHER__" in os.environ:
+                import _winapi
+
+                del os.environ["__PYVENV_LAUNCHER__"]
+                return _winapi.GetModuleFileName(0)
+
+        # We don't need to reinvoke
+        return None
+
+    interpreter = should_reinvoke(options)
+    if interpreter is None:
+        # We don't need to reinvoke - if the user asked us to, tell them why we
+        # aren't.
+        if options.python:
+            logger.warn("Already using interpreter {}".format(sys.executable))
+    else:
         env = os.environ.copy()
-        interpreter = resolve_interpreter(options.python)
-        if interpreter == sys.executable:
-            logger.warn('Already using interpreter %s' % interpreter)
-        else:
-            logger.notify('Running virtualenv with interpreter %s' % interpreter)
-            env['VIRTUALENV_INTERPRETER_RUNNING'] = 'true'
-            file = __file__
-            if file.endswith('.pyc'):
-                file = file[:-1]
-            popen = subprocess.Popen([interpreter, file] + sys.argv[1:], env=env)
-            raise SystemExit(popen.wait())
+        logger.notify("Running virtualenv with interpreter {}".format(interpreter))
+        env["VIRTUALENV_INTERPRETER_RUNNING"] = "true"
+        # Remove the variable __PYVENV_LAUNCHER__ if it's present, as it causes the
+        # interpreter to redirect back to the virtual environment.
+        if "__PYVENV_LAUNCHER__" in env:
+            del env["__PYVENV_LAUNCHER__"]
+        file = __file__
+        if file.endswith(".pyc"):
+            file = file[:-1]
+        elif IS_ZIPAPP:
+            file = HERE
+        sub_process_call = subprocess.Popen([interpreter, file] + sys.argv[1:], env=env)
+        raise SystemExit(sub_process_call.wait())
 
-    # Force --distribute on Python 3, since setuptools is not available.
-    if majver > 2:
-        options.use_distribute = True
-
-    if os.environ.get('PYTHONDONTWRITEBYTECODE') and not options.use_distribute:
-        print(
-            "The PYTHONDONTWRITEBYTECODE environment variable is "
-            "not compatible with setuptools. Either use --distribute "
-            "or unset PYTHONDONTWRITEBYTECODE.")
-        sys.exit(2)
     if not args:
-        print('You must provide a DEST_DIR')
+        print("You must provide a DEST_DIR")
         parser.print_help()
         sys.exit(2)
     if len(args) > 1:
-        print('There must be only one argument: DEST_DIR (you gave %s)' % (
-            ' '.join(args)))
+        print("There must be only one argument: DEST_DIR (you gave {})".format(" ".join(args)))
         parser.print_help()
         sys.exit(2)
 
     home_dir = args[0]
 
-    if os.environ.get('WORKING_ENV'):
-        logger.fatal('ERROR: you cannot run virtualenv while in a workingenv')
-        logger.fatal('Please deactivate your workingenv, then re-run this script')
+    if os.path.exists(home_dir) and os.path.isfile(home_dir):
+        logger.fatal("ERROR: File already exists and is not a directory.")
+        logger.fatal("Please provide a different path or delete the file.")
         sys.exit(3)
 
-    if 'PYTHONHOME' in os.environ:
-        logger.warn('PYTHONHOME is set.  You *must* activate the virtualenv before using it')
-        del os.environ['PYTHONHOME']
+    if os.pathsep in home_dir:
+        logger.fatal("ERROR: target path contains the operating system path separator '{}'".format(os.pathsep))
+        logger.fatal("This is not allowed as would make the activation scripts unusable.".format(os.pathsep))
+        sys.exit(3)
+
+    if os.environ.get("WORKING_ENV"):
+        logger.fatal("ERROR: you cannot run virtualenv while in a working env")
+        logger.fatal("Please deactivate your working env, then re-run this script")
+        sys.exit(3)
+
+    if "PYTHONHOME" in os.environ:
+        logger.warn("PYTHONHOME is set.  You *must* activate the virtualenv before using it")
+        del os.environ["PYTHONHOME"]
 
     if options.relocatable:
         make_environment_relocatable(home_dir)
         return
 
-    if options.no_site_packages:
-        logger.warn('The --no-site-packages flag is deprecated; it is now '
-                    'the default behavior.')
+    with virtualenv_support_dirs() as search_dirs:
+        create_environment(
+            home_dir,
+            site_packages=options.system_site_packages,
+            clear=options.clear,
+            prompt=options.prompt,
+            search_dirs=search_dirs + options.search_dirs,
+            download=options.download,
+            no_setuptools=options.no_setuptools,
+            no_pip=options.no_pip,
+            no_wheel=options.no_wheel,
+            symlink=options.symlink,
+        )
+    if "after_install" in globals():
+        # noinspection PyUnresolvedReferences
+        after_install(options, home_dir)  # noqa: F821
 
-    create_environment(home_dir,
-                       site_packages=options.system_site_packages,
-                       clear=options.clear,
-                       unzip_setuptools=options.unzip_setuptools,
-                       use_distribute=options.use_distribute,
-                       prompt=options.prompt,
-                       search_dirs=options.search_dirs,
-                       never_download=options.never_download)
-    if 'after_install' in globals():
-        after_install(options, home_dir)
 
-def call_subprocess(cmd, show_stdout=True,
-                    filter_stdout=None, cwd=None,
-                    raise_on_returncode=True, extra_env=None,
-                    remove_from_env=None):
+def call_subprocess(
+    cmd,
+    show_stdout=True,
+    filter_stdout=None,
+    cwd=None,
+    raise_on_return_code=True,
+    extra_env=None,
+    remove_from_env=None,
+    stdin=None,
+):
     cmd_parts = []
     for part in cmd:
         if len(part) > 45:
-            part = part[:20]+"..."+part[-20:]
-        if ' ' in part or '\n' in part or '"' in part or "'" in part:
-            part = '"%s"' % part.replace('"', '\\"')
-        if hasattr(part, 'decode'):
+            part = part[:20] + "..." + part[-20:]
+        if " " in part or "\n" in part or '"' in part or "'" in part:
+            part = '"{}"'.format(part.replace('"', '\\"'))
+        if hasattr(part, "decode"):
             try:
                 part = part.decode(sys.getdefaultencoding())
             except UnicodeDecodeError:
                 part = part.decode(sys.getfilesystemencoding())
         cmd_parts.append(part)
-    cmd_desc = ' '.join(cmd_parts)
+    cmd_desc = " ".join(cmd_parts)
     if show_stdout:
         stdout = None
     else:
         stdout = subprocess.PIPE
-    logger.debug("Running command %s" % cmd_desc)
+    logger.debug("Running command {}".format(cmd_desc))
     if extra_env or remove_from_env:
         env = os.environ.copy()
         if extra_env:
             env.update(extra_env)
         if remove_from_env:
-            for varname in remove_from_env:
-                env.pop(varname, None)
+            for var_name in remove_from_env:
+                env.pop(var_name, None)
     else:
         env = None
     try:
         proc = subprocess.Popen(
-            cmd, stderr=subprocess.STDOUT, stdin=None, stdout=stdout,
-            cwd=cwd, env=env)
+            cmd,
+            stderr=subprocess.STDOUT,
+            stdin=None if stdin is None else subprocess.PIPE,
+            stdout=stdout,
+            cwd=cwd,
+            env=env,
+        )
     except Exception:
         e = sys.exc_info()[1]
-        logger.fatal(
-            "Error %s while executing command %s" % (e, cmd_desc))
+        logger.fatal("Error {} while executing command {}".format(e, cmd_desc))
         raise
     all_output = []
     if stdout is not None:
-        stdout = proc.stdout
+        if stdin is not None:
+            with proc.stdin:
+                proc.stdin.write(stdin)
+
         encoding = sys.getdefaultencoding()
         fs_encoding = sys.getfilesystemencoding()
-        while 1:
-            line = stdout.readline()
-            try:
-                line = line.decode(encoding)
-            except UnicodeDecodeError:
-                line = line.decode(fs_encoding)
-            if not line:
-                break
-            line = line.rstrip()
-            all_output.append(line)
-            if filter_stdout:
-                level = filter_stdout(line)
-                if isinstance(level, tuple):
-                    level, line = level
-                logger.log(level, line)
-                if not logger.stdout_level_matches(level):
-                    logger.show_progress()
-            else:
-                logger.info(line)
+        with proc.stdout as stdout:
+            while 1:
+                line = stdout.readline()
+                try:
+                    line = line.decode(encoding)
+                except UnicodeDecodeError:
+                    line = line.decode(fs_encoding)
+                if not line:
+                    break
+                line = line.rstrip()
+                all_output.append(line)
+                if filter_stdout:
+                    level = filter_stdout(line)
+                    if isinstance(level, tuple):
+                        level, line = level
+                    logger.log(level, line)
+                    if not logger.stdout_level_matches(level):
+                        logger.show_progress()
+                else:
+                    logger.info(line)
     else:
-        proc.communicate()
+        proc.communicate(stdin)
     proc.wait()
     if proc.returncode:
-        if raise_on_returncode:
+        if raise_on_return_code:
             if all_output:
-                logger.notify('Complete output from command %s:' % cmd_desc)
-                logger.notify('\n'.join(all_output) + '\n----------------------------------------')
-            raise OSError(
-                "Command %s failed with error code %s"
-                % (cmd_desc, proc.returncode))
+                logger.notify("Complete output from command {}:".format(cmd_desc))
+                logger.notify("\n".join(all_output) + "\n----------------------------------------")
+            raise OSError("Command {} failed with error code {}".format(cmd_desc, proc.returncode))
         else:
-            logger.warn(
-                "Command %s had error code %s"
-                % (cmd_desc, proc.returncode))
+            logger.warn("Command {} had error code {}".format(cmd_desc, proc.returncode))
+    return all_output
+
+
+def filter_install_output(line):
+    if line.strip().startswith("running"):
+        return Logger.INFO
+    return Logger.DEBUG
+
+
+def find_wheels(projects, search_dirs):
+    """Find wheels from which we can import PROJECTS.
+
+    Scan through SEARCH_DIRS for a wheel for each PROJECT in turn. Return
+    a list of the first wheel found for each PROJECT
+    """
+
+    wheels = []
+
+    # Look through SEARCH_DIRS for the first suitable wheel. Don't bother
+    # about version checking here, as this is simply to get something we can
+    # then use to install the correct version.
+    for project in projects:
+        for dirname in search_dirs:
+            # This relies on only having "universal" wheels available.
+            # The pattern could be tightened to require -py2.py3-none-any.whl.
+            files = glob.glob(os.path.join(dirname, "{}-*.whl".format(project)))
+            if files:
+                versions = list(
+                    reversed(
+                        sorted(
+                            [(tuple(int(i) for i in os.path.basename(f).split("-")[1].split(".")), f) for f in files]
+                        )
+                    )
+                )
+                if project == "pip" and sys.version_info[0:2] == (3, 4):
+                    wheel = next(p for v, p in versions if v <= (19, 1, 1))
+                else:
+                    wheel = versions[0][1]
+                wheels.append(wheel)
+                break
+        else:
+            # We're out of luck, so quit with a suitable error
+            logger.fatal("Cannot find a wheel for {}".format(project))
+
+    return wheels
+
+
+def install_wheel(project_names, py_executable, search_dirs=None, download=False):
+    if search_dirs is None:
+        search_dirs_context = virtualenv_support_dirs
+    else:
+
+        @contextlib.contextmanager
+        def search_dirs_context():
+            yield search_dirs
+
+    with search_dirs_context() as search_dirs:
+        _install_wheel_with_search_dir(download, project_names, py_executable, search_dirs)
 
 
-def create_environment(home_dir, site_packages=False, clear=False,
-                       unzip_setuptools=False, use_distribute=False,
-                       prompt=None, search_dirs=None, never_download=False):
+def _install_wheel_with_search_dir(download, project_names, py_executable, search_dirs):
+    wheels = find_wheels(["setuptools", "pip"], search_dirs)
+    python_path = os.pathsep.join(wheels)
+
+    # PIP_FIND_LINKS uses space as the path separator and thus cannot have paths
+    # with spaces in them. Convert any of those to local file:// URL form.
+    try:
+        from urlparse import urljoin
+        from urllib import pathname2url
+    except ImportError:
+        from urllib.parse import urljoin
+        from urllib.request import pathname2url
+
+    def space_path2url(p):
+        if " " not in p:
+            return p
+        return urljoin("file:", pathname2url(os.path.abspath(p)))
+
+    find_links = " ".join(space_path2url(d) for d in search_dirs)
+
+    extra_args = ["--ignore-installed", "-v"]
+    if DEBUG:
+        extra_args.append("-v")
+
+    config = _pip_config(py_executable, python_path)
+    defined_cert = bool(config.get("install.cert") or config.get(":env:.cert") or config.get("global.cert"))
+
+    script = textwrap.dedent(
+        """
+        import sys
+        import pkgutil
+        import tempfile
+        import os
+
+        defined_cert = {defined_cert}
+
+        try:
+            from pip._internal import main as _main
+            if type(_main) is type(sys):  # <type 'module'>
+                _main = _main.main  # nested starting in Pip 19.3
+            cert_data = pkgutil.get_data("pip._vendor.certifi", "cacert.pem")
+        except ImportError:
+            from pip import main as _main
+            cert_data = pkgutil.get_data("pip._vendor.requests", "cacert.pem")
+        except IOError:
+            cert_data = None
+
+        if not defined_cert and cert_data is not None:
+            cert_file = tempfile.NamedTemporaryFile(delete=False)
+            cert_file.write(cert_data)
+            cert_file.close()
+        else:
+            cert_file = None
+
+        try:
+            args = ["install"] + [{extra_args}]
+            if cert_file is not None:
+                args += ["--cert", cert_file.name]
+            args += sys.argv[1:]
+
+            sys.exit(_main(args))
+        finally:
+            if cert_file is not None:
+                os.remove(cert_file.name)
+    """.format(
+            defined_cert=defined_cert, extra_args=", ".join(repr(i) for i in extra_args)
+        )
+    ).encode("utf8")
+
+    if sys.version_info[0:2] == (3, 4) and "pip" in project_names:
+        at = project_names.index("pip")
+        project_names[at] = "pip<19.2"
+
+    cmd = [py_executable, "-"] + project_names
+    logger.start_progress("Installing {}...".format(", ".join(project_names)))
+    logger.indent += 2
+
+    env = {
+        "PYTHONPATH": python_path,
+        "PIP_FIND_LINKS": find_links,
+        "PIP_USE_WHEEL": "1",
+        "PIP_ONLY_BINARY": ":all:",
+        "PIP_USER": "0",
+        "PIP_NO_INPUT": "1",
+    }
+
+    if not download:
+        env["PIP_NO_INDEX"] = "1"
+
+    try:
+        call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=script)
+    finally:
+        logger.indent -= 2
+        logger.end_progress()
+
+
+def _pip_config(py_executable, python_path):
+    cmd = [py_executable, "-m", "pip", "config", "list"]
+    config = {}
+    for line in call_subprocess(
+        cmd,
+        show_stdout=False,
+        extra_env={"PYTHONPATH": python_path},
+        remove_from_env=["PIP_VERBOSE", "PIP_QUIET"],
+        raise_on_return_code=False,
+    ):
+        key, _, value = line.partition("=")
+        if value:
+            config[key] = ast.literal_eval(value)
+    return config
+
+
+def create_environment(
+    home_dir,
+    site_packages=False,
+    clear=False,
+    prompt=None,
+    search_dirs=None,
+    download=False,
+    no_setuptools=False,
+    no_pip=False,
+    no_wheel=False,
+    symlink=True,
+):
     """
     Creates a new environment in ``home_dir``.
 
@@ -1024,464 +1158,642 @@
     """
     home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
 
-    py_executable = os.path.abspath(install_python(
-        home_dir, lib_dir, inc_dir, bin_dir,
-        site_packages=site_packages, clear=clear))
+    py_executable = os.path.abspath(
+        install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages=site_packages, clear=clear, symlink=symlink)
+    )
 
     install_distutils(home_dir)
 
-    # use_distribute also is True if VIRTUALENV_DISTRIBUTE env var is set
-    # we also check VIRTUALENV_USE_DISTRIBUTE for backwards compatibility
-    if use_distribute or os.environ.get('VIRTUALENV_USE_DISTRIBUTE'):
-        install_distribute(py_executable, unzip=unzip_setuptools,
-                           search_dirs=search_dirs, never_download=never_download)
-    else:
-        install_setuptools(py_executable, unzip=unzip_setuptools,
-                           search_dirs=search_dirs, never_download=never_download)
+    to_install = []
+
+    if not no_setuptools:
+        to_install.append("setuptools")
 
-    install_pip(py_executable, search_dirs=search_dirs, never_download=never_download)
+    if not no_pip:
+        to_install.append("pip")
+
+    if not no_wheel:
+        to_install.append("wheel")
+
+    if to_install:
+        install_wheel(to_install, py_executable, search_dirs, download=download)
 
     install_activate(home_dir, bin_dir, prompt)
 
-def path_locations(home_dir):
+    install_python_config(home_dir, bin_dir, prompt)
+
+
+def is_executable_file(fpath):
+    return os.path.isfile(fpath) and is_executable(fpath)
+
+
+def path_locations(home_dir, dry_run=False):
     """Return the path locations for the environment (where libraries are,
     where scripts go, etc)"""
+    home_dir = os.path.abspath(home_dir)
+    lib_dir, inc_dir, bin_dir = None, None, None
     # XXX: We'd use distutils.sysconfig.get_python_inc/lib but its
     # prefix arg is broken: http://bugs.python.org/issue3386
-    if sys.platform == 'win32':
+    if IS_WIN:
         # Windows has lots of problems with executables with spaces in
         # the name; this function will remove them (using the ~1
         # format):
-        mkdir(home_dir)
-        if ' ' in home_dir:
+        if not dry_run:
+            mkdir(home_dir)
+        if " " in home_dir:
+            import ctypes
+
+            get_short_path_name = ctypes.windll.kernel32.GetShortPathNameW
+            size = max(len(home_dir) + 1, 256)
+            buf = ctypes.create_unicode_buffer(size)
             try:
-                import win32api
-            except ImportError:
-                print('Error: the path "%s" has a space in it' % home_dir)
-                print('To handle these kinds of paths, the win32api module must be installed:')
-                print('  http://sourceforge.net/projects/pywin32/')
+                # noinspection PyUnresolvedReferences
+                u = unicode
+            except NameError:
+                u = str
+            ret = get_short_path_name(u(home_dir), buf, size)
+            if not ret:
+                print('Error: the path "{}" has a space in it'.format(home_dir))
+                print("We could not determine the short pathname for it.")
+                print("Exiting.")
                 sys.exit(3)
-            home_dir = win32api.GetShortPathName(home_dir)
-        lib_dir = join(home_dir, 'Lib')
-        inc_dir = join(home_dir, 'Include')
-        bin_dir = join(home_dir, 'Scripts')
-    elif is_jython:
-        lib_dir = join(home_dir, 'Lib')
-        inc_dir = join(home_dir, 'Include')
-        bin_dir = join(home_dir, 'bin')
-    elif is_pypy:
+            home_dir = str(buf.value)
+        lib_dir = join(home_dir, "Lib")
+        inc_dir = join(home_dir, "Include")
+        bin_dir = join(home_dir, "Scripts")
+    if IS_PYPY:
         lib_dir = home_dir
-        inc_dir = join(home_dir, 'include')
-        bin_dir = join(home_dir, 'bin')
-    else:
-        lib_dir = join(home_dir, 'lib', py_version)
-        inc_dir = join(home_dir, 'include', py_version + abiflags)
-        bin_dir = join(home_dir, 'bin')
+        inc_dir = join(home_dir, "include")
+        bin_dir = join(home_dir, "bin")
+    elif not IS_WIN:
+        lib_dir = join(home_dir, "lib", PY_VERSION)
+        inc_dir = join(home_dir, "include", PY_VERSION + ABI_FLAGS)
+        bin_dir = join(home_dir, "bin")
     return home_dir, lib_dir, inc_dir, bin_dir
 
 
 def change_prefix(filename, dst_prefix):
     prefixes = [sys.prefix]
 
-    if sys.platform == "darwin":
-        prefixes.extend((
-            os.path.join("/Library/Python", sys.version[:3], "site-packages"),
-            os.path.join(sys.prefix, "Extras", "lib", "python"),
-            os.path.join("~", "Library", "Python", sys.version[:3], "site-packages")))
+    if IS_DARWIN:
+        prefixes.extend(
+            (
+                os.path.join("/Library/Python", VERSION, "site-packages"),
+                os.path.join(sys.prefix, "Extras", "lib", "python"),
+                os.path.join("~", "Library", "Python", VERSION, "site-packages"),
+                # Python 2.6 no-frameworks
+                os.path.join("~", ".local", "lib", "python", VERSION, "site-packages"),
+                # System Python 2.7 on OSX Mountain Lion
+                os.path.join("~", "Library", "Python", VERSION, "lib", "python", "site-packages"),
+            )
+        )
 
-    if hasattr(sys, 'real_prefix'):
+    if hasattr(sys, "real_prefix"):
         prefixes.append(sys.real_prefix)
+    if hasattr(sys, "base_prefix"):
+        prefixes.append(sys.base_prefix)
+    prefixes = list(map(os.path.expanduser, prefixes))
     prefixes = list(map(os.path.abspath, prefixes))
+    # Check longer prefixes first so we don't split in the middle of a filename
+    prefixes = sorted(prefixes, key=len, reverse=True)
     filename = os.path.abspath(filename)
+    # On Windows, make sure drive letter is uppercase
+    if IS_WIN and filename[0] in "abcdefghijklmnopqrstuvwxyz":
+        filename = filename[0].upper() + filename[1:]
+    for i, prefix in enumerate(prefixes):
+        if IS_WIN and prefix[0] in "abcdefghijklmnopqrstuvwxyz":
+            prefixes[i] = prefix[0].upper() + prefix[1:]
     for src_prefix in prefixes:
         if filename.startswith(src_prefix):
-            _, relpath = filename.split(src_prefix, 1)
-            assert relpath[0] == os.sep
-            relpath = relpath[1:]
-            return join(dst_prefix, relpath)
-    assert False, "Filename %s does not start with any of these prefixes: %s" % \
-        (filename, prefixes)
+            _, relative_path = filename.split(src_prefix, 1)
+            if src_prefix != os.sep:  # sys.prefix == "/"
+                assert relative_path[0] == os.sep
+                relative_path = relative_path[1:]
+            return join(dst_prefix, relative_path)
+    raise AssertionError("Filename {} does not start with any of these prefixes: {}".format(filename, prefixes))
+
+
+def find_module_filename(modname):
+
+    if sys.version_info < (3, 4):
+        # noinspection PyDeprecation
+        import imp
+
+        try:
+            file_handler, filepath, _ = imp.find_module(modname)
+        except ImportError:
+            return None
+        else:
+            if file_handler is not None:
+                file_handler.close()
+            return filepath
+    else:
+        import importlib.util
+
+        if sys.version_info < (3, 5):
+
+            def find_spec(modname):
+                # noinspection PyDeprecation
+                loader = importlib.find_loader(modname)
+                if loader is None:
+                    return None
+                else:
+                    return importlib.util.spec_from_loader(modname, loader)
+
+        else:
+            find_spec = importlib.util.find_spec
+
+        spec = find_spec(modname)
+        if spec is None:
+            return None
+        if not os.path.exists(spec.origin):
+            # https://bitbucket.org/pypy/pypy/issues/2944/origin-for-several-builtin-modules
+            # on pypy3, some builtin modules have a bogus build-time file path, ignore them
+            return None
+        filepath = spec.origin
+        # https://www.python.org/dev/peps/pep-3147/#file guarantee to be non-cached
+        if os.path.basename(filepath) == "__init__.py":
+            filepath = os.path.dirname(filepath)
+        return filepath
+
 
-def copy_required_modules(dst_prefix):
-    import imp
-    # If we are running under -p, we need to remove the current
-    # directory from sys.path temporarily here, so that we
-    # definitely get the modules from the site directory of
-    # the interpreter we are running under, not the one
-    # virtualenv.py is installed under (which might lead to py2/py3
-    # incompatibility issues)
-    _prev_sys_path = sys.path
-    if os.environ.get('VIRTUALENV_INTERPRETER_RUNNING'):
-        sys.path = sys.path[1:]
-    try:
-        for modname in REQUIRED_MODULES:
-            if modname in sys.builtin_module_names:
-                logger.info("Ignoring built-in bootstrap module: %s" % modname)
-                continue
-            try:
-                f, filename, _ = imp.find_module(modname)
-            except ImportError:
-                logger.info("Cannot import bootstrap module: %s" % modname)
+def copy_required_modules(dst_prefix, symlink):
+    for modname in REQUIRED_MODULES:
+        if modname in sys.builtin_module_names:
+            logger.info("Ignoring built-in bootstrap module: %s" % modname)
+            continue
+        filename = find_module_filename(modname)
+        if filename is None:
+            logger.info("Cannot import bootstrap module: %s" % modname)
+        else:
+            # special-case custom readline.so on OS X, but not for pypy:
+            if (
+                modname == "readline"
+                and IS_DARWIN
+                and not (IS_PYPY or filename.endswith(join("lib-dynload", "readline.so")))
+            ):
+                dst_filename = join(dst_prefix, "lib", PY_VERSION, "readline.so")
+            elif modname == "readline" and IS_WIN:
+                # special-case for Windows, where readline is not a standard module, though it may have been installed
+                # in site-packages by a third-party package
+                dst_filename = None
             else:
-                if f is not None:
-                    f.close()
                 dst_filename = change_prefix(filename, dst_prefix)
-                copyfile(filename, dst_filename)
-                if filename.endswith('.pyc'):
-                    pyfile = filename[:-1]
-                    if os.path.exists(pyfile):
-                        copyfile(pyfile, dst_filename[:-1])
-    finally:
-        sys.path = _prev_sys_path
+            if dst_filename is not None:
+                copyfile(filename, dst_filename, symlink)
+            if filename.endswith(".pyc"):
+                py_file = filename[:-1]
+                if os.path.exists(py_file):
+                    copyfile(py_file, dst_filename[:-1], symlink)
+
+
+def copy_required_files(src_dir, lib_dir, symlink):
+    if not os.path.isdir(src_dir):
+        return
+    for fn in os.listdir(src_dir):
+        bn = os.path.splitext(fn)[0]
+        if fn != "site-packages" and bn in REQUIRED_FILES:
+            copyfile(join(src_dir, fn), join(lib_dir, fn), symlink)
+
+
+def copy_license(prefix, dst_prefix, lib_dir, symlink):
+    """Copy the license file so `license()` builtin works"""
+    lib64_dir = lib_dir.replace("lib", "lib64")
+    for license_path in (
+        # posix cpython
+        os.path.join(prefix, os.path.relpath(lib_dir, dst_prefix), "LICENSE.txt"),
+        # posix cpython installed in /usr/lib64
+        os.path.join(prefix, os.path.relpath(lib64_dir, dst_prefix), "LICENSE.txt"),
+        # windows cpython
+        os.path.join(prefix, "LICENSE.txt"),
+        # pypy
+        os.path.join(prefix, "LICENSE"),
+    ):
+        if os.path.exists(license_path):
+            dest = subst_path(license_path, prefix, dst_prefix)
+            copyfile(license_path, dest, symlink)
+            return
+    logger.warn("No LICENSE.txt / LICENSE found in source")
 
-def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear):
+
+def copy_include_dir(include_src, include_dest, symlink):
+    """Copy headers from *include_src* to *include_dest* symlinking if required"""
+    if not os.path.isdir(include_src):
+        return
+    # PyPy headers are located in ``pypy-dir/include`` and following code
+    # avoids making ``venv-dir/include`` symlink to it
+    if IS_PYPY:
+        for fn in os.listdir(include_src):
+            copyfile(join(include_src, fn), join(include_dest, fn), symlink)
+    else:
+        copyfile(include_src, include_dest, symlink)
+
+
+def copy_tcltk(src, dest, symlink):
+    """ copy tcl/tk libraries on Windows (issue #93) """
+    for lib_version in "8.5", "8.6":
+        for libname in "tcl", "tk":
+            src_dir = join(src, "tcl", libname + lib_version)
+            dest_dir = join(dest, "tcl", libname + lib_version)
+            # Only copy the dirs from the above combinations that exist
+            if os.path.exists(src_dir) and not os.path.exists(dest_dir):
+                copy_file_or_folder(src_dir, dest_dir, symlink)
+
+
+def subst_path(prefix_path, prefix, home_dir):
+    prefix_path = os.path.normpath(prefix_path)
+    prefix = os.path.normpath(prefix)
+    home_dir = os.path.normpath(home_dir)
+    if not prefix_path.startswith(prefix):
+        logger.warn("Path not in prefix %r %r", prefix_path, prefix)
+        return
+    return prefix_path.replace(prefix, home_dir, 1)
+
+
+def install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages, clear, symlink=True):
     """Install just the base environment, no distutils patches etc"""
     if sys.executable.startswith(bin_dir):
-        print('Please use the *system* python to run this script')
+        print("Please use the *system* python to run this script")
         return
 
     if clear:
-        rmtree(lib_dir)
-        ## FIXME: why not delete it?
-        ## Maybe it should delete everything with #!/path/to/venv/python in it
-        logger.notify('Not deleting %s', bin_dir)
+        rm_tree(lib_dir)
+        # FIXME: why not delete it?
+        # Maybe it should delete everything with #!/path/to/venv/python in it
+        logger.notify("Not deleting %s", bin_dir)
 
-    if hasattr(sys, 'real_prefix'):
-        logger.notify('Using real prefix %r' % sys.real_prefix)
+    if hasattr(sys, "real_prefix"):
+        logger.notify("Using real prefix %r", sys.real_prefix)
         prefix = sys.real_prefix
+    elif hasattr(sys, "base_prefix"):
+        logger.notify("Using base prefix %r", sys.base_prefix)
+        prefix = sys.base_prefix
     else:
         prefix = sys.prefix
+    prefix = os.path.abspath(prefix)
     mkdir(lib_dir)
-    fix_lib64(lib_dir)
+    fix_lib64(lib_dir, symlink)
     stdlib_dirs = [os.path.dirname(os.__file__)]
-    if sys.platform == 'win32':
-        stdlib_dirs.append(join(os.path.dirname(stdlib_dirs[0]), 'DLLs'))
-    elif sys.platform == 'darwin':
-        stdlib_dirs.append(join(stdlib_dirs[0], 'site-packages'))
-    if hasattr(os, 'symlink'):
-        logger.info('Symlinking Python bootstrap modules')
+    if IS_WIN:
+        stdlib_dirs.append(join(os.path.dirname(stdlib_dirs[0]), "DLLs"))
+    elif IS_DARWIN:
+        stdlib_dirs.append(join(stdlib_dirs[0], "site-packages"))
+    if hasattr(os, "symlink"):
+        logger.info("Symlinking Python bootstrap modules")
     else:
-        logger.info('Copying Python bootstrap modules')
+        logger.info("Copying Python bootstrap modules")
     logger.indent += 2
     try:
         # copy required files...
         for stdlib_dir in stdlib_dirs:
-            if not os.path.isdir(stdlib_dir):
-                continue
-            for fn in os.listdir(stdlib_dir):
-                bn = os.path.splitext(fn)[0]
-                if fn != 'site-packages' and bn in REQUIRED_FILES:
-                    copyfile(join(stdlib_dir, fn), join(lib_dir, fn))
+            copy_required_files(stdlib_dir, lib_dir, symlink)
         # ...and modules
-        copy_required_modules(home_dir)
+        copy_required_modules(home_dir, symlink)
+        copy_license(prefix, home_dir, lib_dir, symlink)
     finally:
         logger.indent -= 2
-    mkdir(join(lib_dir, 'site-packages'))
+    # ...copy tcl/tk
+    if IS_WIN:
+        copy_tcltk(prefix, home_dir, symlink)
+    mkdir(join(lib_dir, "site-packages"))
     import site
+
     site_filename = site.__file__
-    if site_filename.endswith('.pyc'):
+    if site_filename.endswith(".pyc") or site_filename.endswith(".pyo"):
         site_filename = site_filename[:-1]
-    elif site_filename.endswith('$py.class'):
-        site_filename = site_filename.replace('$py.class', '.py')
+    elif site_filename.endswith("$py.class"):
+        site_filename = site_filename.replace("$py.class", ".py")
     site_filename_dst = change_prefix(site_filename, home_dir)
     site_dir = os.path.dirname(site_filename_dst)
     writefile(site_filename_dst, SITE_PY)
-    writefile(join(site_dir, 'orig-prefix.txt'), prefix)
-    site_packages_filename = join(site_dir, 'no-global-site-packages.txt')
+    writefile(join(site_dir, "orig-prefix.txt"), prefix)
+    site_packages_filename = join(site_dir, "no-global-site-packages.txt")
     if not site_packages:
-        writefile(site_packages_filename, '')
+        writefile(site_packages_filename, "")
+
+    if IS_PYPY or IS_WIN:
+        standard_lib_include_dir = join(prefix, "include")
     else:
-        if os.path.exists(site_packages_filename):
-            logger.info('Deleting %s' % site_packages_filename)
-            os.unlink(site_packages_filename)
+        standard_lib_include_dir = join(prefix, "include", PY_VERSION + ABI_FLAGS)
+    if os.path.exists(standard_lib_include_dir):
+        copy_include_dir(standard_lib_include_dir, inc_dir, symlink)
+    else:
+        logger.debug("No include dir %s", standard_lib_include_dir)
 
-    if is_pypy or is_win:
-        stdinc_dir = join(prefix, 'include')
-    else:
-        stdinc_dir = join(prefix, 'include', py_version + abiflags)
-    if os.path.exists(stdinc_dir):
-        copyfile(stdinc_dir, inc_dir)
-    else:
-        logger.debug('No include dir %s' % stdinc_dir)
+    platform_include_dir = distutils.sysconfig.get_python_inc(plat_specific=1)
+    if platform_include_dir != standard_lib_include_dir:
+        platform_include_dest = distutils.sysconfig.get_python_inc(plat_specific=1, prefix=home_dir)
+        if platform_include_dir == platform_include_dest:
+            # Do platinc_dest manually due to a CPython bug;
+            # not http://bugs.python.org/issue3386 but a close cousin
+            platform_include_dest = subst_path(platform_include_dir, prefix, home_dir)
+        if platform_include_dest:
+            # PyPy's stdinc_dir and prefix are relative to the original binary
+            # (traversing virtualenvs), whereas the platinc_dir is relative to
+            # the inner virtualenv and ignores the prefix argument.
+            # This seems more evolved than designed.
+            copy_include_dir(platform_include_dir, platform_include_dest, symlink)
 
     # pypy never uses exec_prefix, just ignore it
-    if sys.exec_prefix != prefix and not is_pypy:
-        if sys.platform == 'win32':
-            exec_dir = join(sys.exec_prefix, 'lib')
-        elif is_jython:
-            exec_dir = join(sys.exec_prefix, 'Lib')
+    if os.path.realpath(sys.exec_prefix) != os.path.realpath(prefix) and not IS_PYPY:
+        if IS_WIN:
+            exec_dir = join(sys.exec_prefix, "lib")
         else:
-            exec_dir = join(sys.exec_prefix, 'lib', py_version)
-        for fn in os.listdir(exec_dir):
-            copyfile(join(exec_dir, fn), join(lib_dir, fn))
-
-    if is_jython:
-        # Jython has either jython-dev.jar and javalib/ dir, or just
-        # jython.jar
-        for name in 'jython-dev.jar', 'javalib', 'jython.jar':
-            src = join(prefix, name)
-            if os.path.exists(src):
-                copyfile(src, join(home_dir, name))
-        # XXX: registry should always exist after Jython 2.5rc1
-        src = join(prefix, 'registry')
-        if os.path.exists(src):
-            copyfile(src, join(home_dir, 'registry'), symlink=False)
-        copyfile(join(prefix, 'cachedir'), join(home_dir, 'cachedir'),
-                 symlink=False)
+            exec_dir = join(sys.exec_prefix, "lib", PY_VERSION)
+        copy_required_files(exec_dir, lib_dir, symlink)
 
     mkdir(bin_dir)
     py_executable = join(bin_dir, os.path.basename(sys.executable))
-    if 'Python.framework' in prefix:
-        if re.search(r'/Python(?:-32|-64)*$', py_executable):
+    if "Python.framework" in prefix or "Python3.framework" in prefix:
+        # OS X framework builds cause validation to break
+        # https://github.com/pypa/virtualenv/issues/322
+        if os.environ.get("__PYVENV_LAUNCHER__"):
+            del os.environ["__PYVENV_LAUNCHER__"]
+        if re.search(r"/Python(?:-32|-64)*$", py_executable):
             # The name of the python executable is not quite what
             # we want, rename it.
-            py_executable = os.path.join(
-                    os.path.dirname(py_executable), 'python')
+            py_executable = os.path.join(os.path.dirname(py_executable), "python")
 
-    logger.notify('New %s executable in %s', expected_exe, py_executable)
-    pcbuild_dir = os.path.dirname(sys.executable)
-    pyd_pth = os.path.join(lib_dir, 'site-packages', 'virtualenv_builddir_pyd.pth')
-    if is_win and os.path.exists(os.path.join(pcbuild_dir, 'build.bat')):
-        logger.notify('Detected python running from build directory %s', pcbuild_dir)
-        logger.notify('Writing .pth file linking to build directory for *.pyd files')
-        writefile(pyd_pth, pcbuild_dir)
+    logger.notify("New %s executable in %s", EXPECTED_EXE, py_executable)
+    pc_build_dir = os.path.dirname(sys.executable)
+    pyd_pth = os.path.join(lib_dir, "site-packages", "virtualenv_builddir_pyd.pth")
+    if IS_WIN and os.path.exists(os.path.join(pc_build_dir, "build.bat")):
+        logger.notify("Detected python running from build directory %s", pc_build_dir)
+        logger.notify("Writing .pth file linking to build directory for *.pyd files")
+        writefile(pyd_pth, pc_build_dir)
     else:
-        pcbuild_dir = None
         if os.path.exists(pyd_pth):
-            logger.info('Deleting %s (not Windows env or not build directory python)' % pyd_pth)
+            logger.info("Deleting %s (not Windows env or not build directory python)", pyd_pth)
             os.unlink(pyd_pth)
-        
+
     if sys.executable != py_executable:
-        ## FIXME: could I just hard link?
+        # FIXME: could I just hard link?
         executable = sys.executable
-        if sys.platform == 'cygwin' and os.path.exists(executable + '.exe'):
-            # Cygwin misreports sys.executable sometimes
-            executable += '.exe'
-            py_executable += '.exe'
-            logger.info('Executable actually exists in %s' % executable)
         shutil.copyfile(executable, py_executable)
         make_exe(py_executable)
-        if sys.platform == 'win32' or sys.platform == 'cygwin':
-            pythonw = os.path.join(os.path.dirname(sys.executable), 'pythonw.exe')
-            if os.path.exists(pythonw):
-                logger.info('Also created pythonw.exe')
-                shutil.copyfile(pythonw, os.path.join(os.path.dirname(py_executable), 'pythonw.exe'))
-            python_d = os.path.join(os.path.dirname(sys.executable), 'python_d.exe')
-            python_d_dest = os.path.join(os.path.dirname(py_executable), 'python_d.exe')
+        if IS_WIN or IS_CYGWIN:
+            python_w = os.path.join(os.path.dirname(sys.executable), "pythonw.exe")
+            if os.path.exists(python_w):
+                logger.info("Also created pythonw.exe")
+                shutil.copyfile(python_w, os.path.join(os.path.dirname(py_executable), "pythonw.exe"))
+            python_d = os.path.join(os.path.dirname(sys.executable), "python_d.exe")
+            python_d_dest = os.path.join(os.path.dirname(py_executable), "python_d.exe")
             if os.path.exists(python_d):
-                logger.info('Also created python_d.exe')
+                logger.info("Also created python_d.exe")
                 shutil.copyfile(python_d, python_d_dest)
             elif os.path.exists(python_d_dest):
-                logger.info('Removed python_d.exe as it is no longer at the source')
+                logger.info("Removed python_d.exe as it is no longer at the source")
                 os.unlink(python_d_dest)
+
             # we need to copy the DLL to enforce that windows will load the correct one.
             # may not exist if we are cygwin.
-            py_executable_dll = 'python%s%s.dll' % (
-                sys.version_info[0], sys.version_info[1])
-            py_executable_dll_d = 'python%s%s_d.dll' % (
-                sys.version_info[0], sys.version_info[1])
-            pythondll = os.path.join(os.path.dirname(sys.executable), py_executable_dll)
-            pythondll_d = os.path.join(os.path.dirname(sys.executable), py_executable_dll_d)
-            pythondll_d_dest = os.path.join(os.path.dirname(py_executable), py_executable_dll_d)
-            if os.path.exists(pythondll):
-                logger.info('Also created %s' % py_executable_dll)
-                shutil.copyfile(pythondll, os.path.join(os.path.dirname(py_executable), py_executable_dll))
-            if os.path.exists(pythondll_d):
-                logger.info('Also created %s' % py_executable_dll_d)
-                shutil.copyfile(pythondll_d, pythondll_d_dest)
-            elif os.path.exists(pythondll_d_dest):
-                logger.info('Removed %s as the source does not exist' % pythondll_d_dest)
-                os.unlink(pythondll_d_dest)
-        if is_pypy:
+            if IS_PYPY:
+                py_executable_dll_s = [("libpypy-c.dll", "libpypy_d-c.dll")]
+            else:
+                py_executable_dll_s = [
+                    ("python{}.dll".format(sys.version_info[0]), "python{}_d.dll".format(sys.version_info[0])),
+                    (
+                        "python{}{}.dll".format(sys.version_info[0], sys.version_info[1]),
+                        "python{}{}_d.dll".format(sys.version_info[0], sys.version_info[1]),
+                    ),
+                ]
+
+            for py_executable_dll, py_executable_dll_d in py_executable_dll_s:
+                python_dll = os.path.join(os.path.dirname(sys.executable), py_executable_dll)
+                python_dll_d = os.path.join(os.path.dirname(sys.executable), py_executable_dll_d)
+                python_dll_d_dest = os.path.join(os.path.dirname(py_executable), py_executable_dll_d)
+                if os.path.exists(python_dll):
+                    logger.info("Also created %s", py_executable_dll)
+                    shutil.copyfile(python_dll, os.path.join(os.path.dirname(py_executable), py_executable_dll))
+                if os.path.exists(python_dll_d):
+                    logger.info("Also created %s", py_executable_dll_d)
+                    shutil.copyfile(python_dll_d, python_dll_d_dest)
+                elif os.path.exists(python_dll_d_dest):
+                    logger.info("Removed %s as the source does not exist", python_dll_d_dest)
+                    os.unlink(python_dll_d_dest)
+        if IS_PYPY:
             # make a symlink python --> pypy-c
-            python_executable = os.path.join(os.path.dirname(py_executable), 'python')
-            logger.info('Also created executable %s' % python_executable)
-            copyfile(py_executable, python_executable)
+            python_executable = os.path.join(os.path.dirname(py_executable), "python")
+            if IS_WIN or IS_CYGWIN:
+                python_executable += ".exe"
+            logger.info("Also created executable %s", python_executable)
+            copyfile(py_executable, python_executable, symlink)
+
+            if IS_WIN:
+                for name in ["libexpat.dll", "libeay32.dll", "ssleay32.dll", "sqlite3.dll", "tcl85.dll", "tk85.dll"]:
+                    src = join(prefix, name)
+                    if os.path.exists(src):
+                        copyfile(src, join(bin_dir, name), symlink)
 
-    if os.path.splitext(os.path.basename(py_executable))[0] != expected_exe:
-        secondary_exe = os.path.join(os.path.dirname(py_executable),
-                                     expected_exe)
+                for d in sys.path:
+                    if d.endswith("lib_pypy"):
+                        break
+                else:
+                    logger.fatal("Could not find lib_pypy in sys.path")
+                    raise SystemExit(3)
+                logger.info("Copying lib_pypy")
+                copyfile(d, os.path.join(home_dir, "lib_pypy"), symlink)
+
+    if os.path.splitext(os.path.basename(py_executable))[0] != EXPECTED_EXE:
+        secondary_exe = os.path.join(os.path.dirname(py_executable), EXPECTED_EXE)
         py_executable_ext = os.path.splitext(py_executable)[1]
-        if py_executable_ext == '.exe':
+        if py_executable_ext.lower() == ".exe":
             # python2.4 gives an extension of '.4' :P
             secondary_exe += py_executable_ext
         if os.path.exists(secondary_exe):
-            logger.warn('Not overwriting existing %s script %s (you must use %s)'
-                        % (expected_exe, secondary_exe, py_executable))
+            logger.warn(
+                "Not overwriting existing {} script {} (you must use {})".format(
+                    EXPECTED_EXE, secondary_exe, py_executable
+                )
+            )
         else:
-            logger.notify('Also creating executable in %s' % secondary_exe)
+            logger.notify("Also creating executable in %s", secondary_exe)
             shutil.copyfile(sys.executable, secondary_exe)
             make_exe(secondary_exe)
 
-    if '.framework' in prefix:
-        if 'Python.framework' in prefix:
-            logger.debug('MacOSX Python framework detected')
-            # Make sure we use the the embedded interpreter inside
+    if ".framework" in prefix:
+        original_python = None
+        if "Python.framework" in prefix or "Python3.framework" in prefix:
+            logger.debug("MacOSX Python framework detected")
+            # Make sure we use the embedded interpreter inside
             # the framework, even if sys.executable points to
             # the stub executable in ${sys.prefix}/bin
             # See http://groups.google.com/group/python-virtualenv/
             #                              browse_thread/thread/17cab2f85da75951
-            original_python = os.path.join(
-                prefix, 'Resources/Python.app/Contents/MacOS/Python')
-        if 'EPD' in prefix:
-            logger.debug('EPD framework detected')
-            original_python = os.path.join(prefix, 'bin/python')
+            original_python = os.path.join(prefix, "Resources/Python.app/Contents/MacOS/Python")
+        if "EPD" in prefix:
+            logger.debug("EPD framework detected")
+            original_python = os.path.join(prefix, "bin/python")
         shutil.copy(original_python, py_executable)
 
         # Copy the framework's dylib into the virtual
         # environment
-        virtual_lib = os.path.join(home_dir, '.Python')
+        virtual_lib = os.path.join(home_dir, ".Python")
 
         if os.path.exists(virtual_lib):
             os.unlink(virtual_lib)
-        copyfile(
-            os.path.join(prefix, 'Python'),
-            virtual_lib)
+        lib_name = "Python3" if "Python3.framework" in prefix else "Python"
+        copyfile(os.path.join(prefix, lib_name), virtual_lib, symlink)
 
         # And then change the install_name of the copied python executable
+        search = (
+            "@executable_path/../../../../Python3" if "Python3.framework" in prefix else os.path.join(prefix, lib_name)
+        )
+        # noinspection PyBroadException
         try:
-            call_subprocess(
-                ["install_name_tool", "-change",
-                 os.path.join(prefix, 'Python'),
-                 '@executable_path/../.Python',
-                 py_executable])
-        except:
-            logger.fatal(
-                "Could not call install_name_tool -- you must have Apple's development tools installed")
-            raise
+            mach_o_change(py_executable, search, "@executable_path/../.Python")
+        except Exception:
+            e = sys.exc_info()[1]
+            logger.warn("Could not call mach_o_change: %s. " "Trying to call install_name_tool instead.", e)
+            try:
+                call_subprocess(["install_name_tool", "-change", search, "@executable_path/../.Python", py_executable])
+            except Exception:
+                logger.fatal("Could not call install_name_tool -- you must " "have Apple's development tools installed")
+                raise
+
+    if not IS_WIN:
+        # Ensure that 'python', 'pythonX' and 'pythonX.Y' all exist
+        py_exe_version_major = "python{}".format(sys.version_info[0])
+        py_exe_version_major_minor = "python{}.{}".format(sys.version_info[0], sys.version_info[1])
+        py_exe_no_version = "python"
+        required_symlinks = [py_exe_no_version, py_exe_version_major, py_exe_version_major_minor]
 
-        # Some tools depend on pythonX.Y being present
-        py_executable_version = '%s.%s' % (
-            sys.version_info[0], sys.version_info[1])
-        if not py_executable.endswith(py_executable_version):
-            # symlinking pythonX.Y > python
-            pth = py_executable + '%s.%s' % (
-                    sys.version_info[0], sys.version_info[1])
-            if os.path.exists(pth):
-                os.unlink(pth)
-            os.symlink('python', pth)
-        else:
-            # reverse symlinking python -> pythonX.Y (with --python)
-            pth = join(bin_dir, 'python')
-            if os.path.exists(pth):
-                os.unlink(pth)
-            os.symlink(os.path.basename(py_executable), pth)
+        py_executable_base = os.path.basename(py_executable)
+
+        if py_executable_base in required_symlinks:
+            # Don't try to symlink to yourself.
+            required_symlinks.remove(py_executable_base)
 
-    if sys.platform == 'win32' and ' ' in py_executable:
-        # There's a bug with subprocess on Windows when using a first
-        # argument that has a space in it.  Instead we have to quote
-        # the value:
-        py_executable = '"%s"' % py_executable
-    cmd = [py_executable, '-c', """
-import sys
-prefix = sys.prefix
-if sys.version_info[0] == 3:
-    prefix = prefix.encode('utf8')
-if hasattr(sys.stdout, 'detach'):
-    sys.stdout = sys.stdout.detach()
-elif hasattr(sys.stdout, 'buffer'):
-    sys.stdout = sys.stdout.buffer
-sys.stdout.write(prefix)
-"""]
-    logger.info('Testing executable with %s %s "%s"' % tuple(cmd))
+        for pth in required_symlinks:
+            full_pth = join(bin_dir, pth)
+            if os.path.exists(full_pth):
+                os.unlink(full_pth)
+            if symlink:
+                os.symlink(py_executable_base, full_pth)
+            else:
+                copyfile(py_executable, full_pth, symlink)
+
+    cmd = [
+        py_executable,
+        "-c",
+        "import sys;out=sys.stdout;" 'getattr(out, "buffer", out).write(sys.prefix.encode("utf-8"))',
+    ]
+    logger.info('Testing executable with %s %s "%s"', *cmd)
     try:
-        proc = subprocess.Popen(cmd,
-                            stdout=subprocess.PIPE)
+        proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
         proc_stdout, proc_stderr = proc.communicate()
     except OSError:
         e = sys.exc_info()[1]
         if e.errno == errno.EACCES:
-            logger.fatal('ERROR: The executable %s could not be run: %s' % (py_executable, e))
+            logger.fatal("ERROR: The executable {} could not be run: {}".format(py_executable, e))
             sys.exit(100)
         else:
-          raise e
+            raise e
 
     proc_stdout = proc_stdout.strip().decode("utf-8")
-    proc_stdout = os.path.normcase(os.path.abspath(proc_stdout))
-    norm_home_dir = os.path.normcase(os.path.abspath(home_dir))
-    if hasattr(norm_home_dir, 'decode'):
+    # normalize paths using realpath to ensure that a virtualenv correctly identifies itself even
+    # when addressed over a symlink
+    proc_stdout = os.path.normcase(os.path.realpath(proc_stdout))
+    norm_home_dir = os.path.normcase(os.path.realpath(home_dir))
+    if hasattr(norm_home_dir, "decode"):
         norm_home_dir = norm_home_dir.decode(sys.getfilesystemencoding())
     if proc_stdout != norm_home_dir:
-        logger.fatal(
-            'ERROR: The executable %s is not functioning' % py_executable)
-        logger.fatal(
-            'ERROR: It thinks sys.prefix is %r (should be %r)'
-            % (proc_stdout, norm_home_dir))
-        logger.fatal(
-            'ERROR: virtualenv is not compatible with this system or executable')
-        if sys.platform == 'win32':
+        logger.fatal("ERROR: The executable %s is not functioning", py_executable)
+        logger.fatal("ERROR: It thinks sys.prefix is {!r} (should be {!r})".format(proc_stdout, norm_home_dir))
+        logger.fatal("ERROR: virtualenv is not compatible with this system or executable")
+        if IS_WIN:
             logger.fatal(
-                'Note: some Windows users have reported this error when they '
+                "Note: some Windows users have reported this error when they "
                 'installed Python for "Only this user" or have multiple '
-                'versions of Python installed. Copying the appropriate '
-                'PythonXX.dll to the virtualenv Scripts/ directory may fix '
-                'this problem.')
+                "versions of Python installed. Copying the appropriate "
+                "PythonXX.dll to the virtualenv Scripts/ directory may fix "
+                "this problem."
+            )
         sys.exit(100)
     else:
-        logger.info('Got sys.prefix result: %r' % proc_stdout)
+        logger.info("Got sys.prefix result: %r", proc_stdout)
 
-    pydistutils = os.path.expanduser('~/.pydistutils.cfg')
+    pydistutils = os.path.expanduser("~/.pydistutils.cfg")
     if os.path.exists(pydistutils):
-        logger.notify('Please make sure you remove any previous custom paths from '
-                      'your %s file.' % pydistutils)
-    ## FIXME: really this should be calculated earlier
+        logger.notify("Please make sure you remove any previous custom paths from " "your %s file.", pydistutils)
+    # FIXME: really this should be calculated earlier
+
+    fix_local_scheme(home_dir, symlink)
 
-    fix_local_scheme(home_dir)
+    if site_packages:
+        if os.path.exists(site_packages_filename):
+            logger.info("Deleting %s", site_packages_filename)
+            os.unlink(site_packages_filename)
 
     return py_executable
 
+
 def install_activate(home_dir, bin_dir, prompt=None):
-    home_dir = os.path.abspath(home_dir)
-    if sys.platform == 'win32' or is_jython and os._name == 'nt':
-        files = {
-            'activate.bat': ACTIVATE_BAT,
-            'deactivate.bat': DEACTIVATE_BAT,
-            'activate.ps1': ACTIVATE_PS,
-        }
+    if IS_WIN:
+        files = {"activate.bat": ACTIVATE_BAT, "deactivate.bat": DEACTIVATE_BAT, "activate.ps1": ACTIVATE_PS}
 
         # MSYS needs paths of the form /c/path/to/file
-        drive, tail = os.path.splitdrive(home_dir.replace(os.sep, '/'))
-        home_dir_msys = (drive and "/%s%s" or "%s%s") % (drive[:1], tail)
+        drive, tail = os.path.splitdrive(home_dir.replace(os.sep, "/"))
+        home_dir_msys = (drive and "/{}{}" or "{}{}").format(drive[:1], tail)
 
         # Run-time conditional enables (basic) Cygwin compatibility
-        home_dir_sh = ("""$(if [ "$OSTYPE" "==" "cygwin" ]; then cygpath -u '%s'; else echo '%s'; fi;)""" % 
-                       (home_dir, home_dir_msys))
-        files['activate'] = ACTIVATE_SH.replace('__VIRTUAL_ENV__', home_dir_sh)
+        home_dir_sh = """$(if [ "$OSTYPE" "==" "cygwin" ]; then cygpath -u '{}'; else echo '{}'; fi;)""".format(
+            home_dir, home_dir_msys
+        )
+        files["activate"] = ACTIVATE_SH.replace("__VIRTUAL_ENV__", home_dir_sh)
 
     else:
-        files = {'activate': ACTIVATE_SH}
+        files = {
+            "activate": ACTIVATE_SH,
+            "activate.fish": ACTIVATE_FISH,
+            "activate.csh": ACTIVATE_CSH,
+            "activate.ps1": ACTIVATE_PS,
+        }
+    files["activate_this.py"] = ACTIVATE_THIS
 
-        # suppling activate.fish in addition to, not instead of, the
-        # bash script support.
-        files['activate.fish'] = ACTIVATE_FISH
+    if sys.version_info >= (3, 4):
+        # Add xonsh support
+        files["activate.xsh"] = ACTIVATE_XSH
 
-        # same for csh/tcsh support...
-        files['activate.csh'] = ACTIVATE_CSH
+    install_files(home_dir, bin_dir, prompt, files)
+
 
-    files['activate_this.py'] = ACTIVATE_THIS
-    if hasattr(home_dir, 'decode'):
+def install_files(home_dir, bin_dir, prompt, files):
+    if hasattr(home_dir, "decode"):
         home_dir = home_dir.decode(sys.getfilesystemencoding())
-    vname = os.path.basename(home_dir)
+    virtualenv_name = os.path.basename(home_dir)
     for name, content in files.items():
-        content = content.replace('__VIRTUAL_PROMPT__', prompt or '')
-        content = content.replace('__VIRTUAL_WINPROMPT__', prompt or '(%s)' % vname)
-        content = content.replace('__VIRTUAL_ENV__', home_dir)
-        content = content.replace('__VIRTUAL_NAME__', vname)
-        content = content.replace('__BIN_NAME__', os.path.basename(bin_dir))
+        content = content.replace("__VIRTUAL_PROMPT__", prompt or "")
+        content = content.replace("__VIRTUAL_WINPROMPT__", prompt or "({}) ".format(virtualenv_name))
+        content = content.replace("__VIRTUAL_ENV__", home_dir)
+        content = content.replace("__VIRTUAL_NAME__", virtualenv_name)
+        content = content.replace("__BIN_NAME__", os.path.basename(bin_dir))
+        content = content.replace("__PATH_SEP__", os.pathsep)
         writefile(os.path.join(bin_dir, name), content)
 
+
+def install_python_config(home_dir, bin_dir, prompt=None):
+    if IS_WIN:
+        files = {}
+    else:
+        files = {"python-config": PYTHON_CONFIG}
+    install_files(home_dir, bin_dir, prompt, files)
+    for name, _ in files.items():
+        make_exe(os.path.join(bin_dir, name))
+
+
 def install_distutils(home_dir):
     distutils_path = change_prefix(distutils.__path__[0], home_dir)
     mkdir(distutils_path)
-    ## FIXME: maybe this prefix setting should only be put in place if
-    ## there's a local distutils.cfg with a prefix setting?
-    home_dir = os.path.abspath(home_dir)
-    ## FIXME: this is breaking things, removing for now:
-    #distutils_cfg = DISTUTILS_CFG + "\n[install]\nprefix=%s\n" % home_dir
-    writefile(os.path.join(distutils_path, '__init__.py'), DISTUTILS_INIT)
-    writefile(os.path.join(distutils_path, 'distutils.cfg'), DISTUTILS_CFG, overwrite=False)
+    # FIXME: maybe this prefix setting should only be put in place if
+    # there's a local distutils.cfg with a prefix setting?
+    # FIXME: this is breaking things, removing for now:
+    # distutils_cfg = DISTUTILS_CFG + "\n[install]\nprefix=%s\n" home_dir
+    writefile(os.path.join(distutils_path, "__init__.py"), DISTUTILS_INIT)
+    writefile(os.path.join(distutils_path, "distutils.cfg"), DISTUTILS_CFG, overwrite=False)
 
-def fix_local_scheme(home_dir):
+
+def fix_local_scheme(home_dir, symlink=True):
     """
     Platforms that use the "posix_local" install scheme (like Ubuntu with
     Python 2.7) need to be given an additional "local" location, sigh.
@@ -1491,183 +1803,240 @@
     except ImportError:
         pass
     else:
-        if sysconfig._get_default_scheme() == 'posix_local':
-            local_path = os.path.join(home_dir, 'local')
+        # noinspection PyProtectedMember
+        if sysconfig._get_default_scheme() == "posix_local":
+            local_path = os.path.join(home_dir, "local")
             if not os.path.exists(local_path):
                 os.mkdir(local_path)
                 for subdir_name in os.listdir(home_dir):
-                    if subdir_name == 'local':
+                    if subdir_name == "local":
                         continue
-                    os.symlink(os.path.abspath(os.path.join(home_dir, subdir_name)), \
-                                                            os.path.join(local_path, subdir_name))
+                    copyfile(
+                        os.path.abspath(os.path.join(home_dir, subdir_name)),
+                        os.path.join(local_path, subdir_name),
+                        symlink,
+                    )
 
-def fix_lib64(lib_dir):
+
+def fix_lib64(lib_dir, symlink=True):
     """
     Some platforms (particularly Gentoo on x64) put things in lib64/pythonX.Y
     instead of lib/pythonX.Y.  If this is such a platform we'll just create a
     symlink so lib64 points to lib
     """
-    if [p for p in distutils.sysconfig.get_config_vars().values()
-        if isinstance(p, basestring) and 'lib64' in p]:
-        logger.debug('This system uses lib64; symlinking lib64 to lib')
-        assert os.path.basename(lib_dir) == 'python%s' % sys.version[:3], (
-            "Unexpected python lib dir: %r" % lib_dir)
-        lib_parent = os.path.dirname(lib_dir)
-        assert os.path.basename(lib_parent) == 'lib', (
-            "Unexpected parent dir: %r" % lib_parent)
-        copyfile(lib_parent, os.path.join(os.path.dirname(lib_parent), 'lib64'))
+    # PyPy's library path scheme is not affected by this.
+    # Return early or we will die on the following assert.
+    if IS_PYPY:
+        logger.debug("PyPy detected, skipping lib64 symlinking")
+        return
+    # Check we have a lib64 library path
+    if not [p for p in distutils.sysconfig.get_config_vars().values() if isinstance(p, basestring) and "lib64" in p]:
+        return
+
+    logger.debug("This system uses lib64; symlinking lib64 to lib")
+
+    assert os.path.basename(lib_dir) == PY_VERSION, "Unexpected python lib dir: {!r}".format(lib_dir)
+    lib_parent = os.path.dirname(lib_dir)
+    top_level = os.path.dirname(lib_parent)
+    lib_dir = os.path.join(top_level, "lib")
+    lib64_link = os.path.join(top_level, "lib64")
+    assert os.path.basename(lib_parent) == "lib", "Unexpected parent dir: {!r}".format(lib_parent)
+    if os.path.lexists(lib64_link):
+        return
+    if symlink:
+        os.symlink("lib", lib64_link)
+    else:
+        copyfile(lib_dir, lib64_link, symlink=False)
+
 
 def resolve_interpreter(exe):
     """
     If the executable given isn't an absolute path, search $PATH for the interpreter
     """
+    # If the "executable" is a version number, get the installed executable for
+    # that version
+    orig_exe = exe
+    python_versions = get_installed_pythons()
+    if exe in python_versions:
+        exe = python_versions[exe]
+
     if os.path.abspath(exe) != exe:
-        paths = os.environ.get('PATH', '').split(os.pathsep)
-        for path in paths:
-            if os.path.exists(os.path.join(path, exe)):
-                exe = os.path.join(path, exe)
-                break
+        exe = distutils.spawn.find_executable(exe) or exe
     if not os.path.exists(exe):
-        logger.fatal('The executable %s (from --python=%s) does not exist' % (exe, exe))
+        logger.fatal("The path {} (from --python={}) does not exist".format(exe, orig_exe))
         raise SystemExit(3)
     if not is_executable(exe):
-        logger.fatal('The executable %s (from --python=%s) is not executable' % (exe, exe))
+        logger.fatal("The path {} (from --python={}) is not an executable file".format(exe, orig_exe))
         raise SystemExit(3)
     return exe
 
+
 def is_executable(exe):
     """Checks a file is executable"""
-    return os.access(exe, os.X_OK)
+    return os.path.isfile(exe) and os.access(exe, os.X_OK)
 
-############################################################
-## Relocating the environment:
 
+# Relocating the environment:
 def make_environment_relocatable(home_dir):
     """
     Makes the already-existing environment use relative paths, and takes out
     the #!-based environment selection in scripts.
     """
     home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
-    activate_this = os.path.join(bin_dir, 'activate_this.py')
+    activate_this = os.path.join(bin_dir, "activate_this.py")
     if not os.path.exists(activate_this):
         logger.fatal(
-            'The environment doesn\'t have a file %s -- please re-run virtualenv '
-            'on this environment to update it' % activate_this)
-    fixup_scripts(home_dir)
+            "The environment doesn't have a file %s -- please re-run virtualenv " "on this environment to update it",
+            activate_this,
+        )
+    fixup_scripts(home_dir, bin_dir)
     fixup_pth_and_egg_link(home_dir)
-    ## FIXME: need to fix up distutils.cfg
+    # FIXME: need to fix up distutils.cfg
+
 
-OK_ABS_SCRIPTS = ['python', 'python%s' % sys.version[:3],
-                  'activate', 'activate.bat', 'activate_this.py']
+OK_ABS_SCRIPTS = [
+    "python",
+    PY_VERSION,
+    "activate",
+    "activate.bat",
+    "activate_this.py",
+    "activate.fish",
+    "activate.csh",
+    "activate.xsh",
+]
 
-def fixup_scripts(home_dir):
+
+def fixup_scripts(_, bin_dir):
+    if IS_WIN:
+        new_shebang_args = ("{} /c".format(os.path.normcase(os.environ.get("COMSPEC", "cmd.exe"))), "", ".exe")
+    else:
+        new_shebang_args = ("/usr/bin/env", VERSION, "")
+
     # This is what we expect at the top of scripts:
-    shebang = '#!%s/bin/python' % os.path.normcase(os.path.abspath(home_dir))
+    shebang = "#!{}".format(
+        os.path.normcase(os.path.join(os.path.abspath(bin_dir), "python{}".format(new_shebang_args[2])))
+    )
     # This is what we'll put:
-    new_shebang = '#!/usr/bin/env python%s' % sys.version[:3]
-    activate = "import os; activate_this=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'activate_this.py'); execfile(activate_this, dict(__file__=activate_this)); del os, activate_this"
-    if sys.platform == 'win32':
-        bin_suffix = 'Scripts'
-    else:
-        bin_suffix = 'bin'
-    bin_dir = os.path.join(home_dir, bin_suffix)
-    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
+    new_shebang = "#!{} python{}{}".format(*new_shebang_args)
+
     for filename in os.listdir(bin_dir):
         filename = os.path.join(bin_dir, filename)
         if not os.path.isfile(filename):
-            # ignore subdirs, e.g. .svn ones.
+            # ignore child directories, e.g. .svn ones.
             continue
-        f = open(filename, 'rb')
-        try:
+        with open(filename, "rb") as f:
             try:
-                lines = f.read().decode('utf-8').splitlines()
+                lines = f.read().decode("utf-8").splitlines()
             except UnicodeDecodeError:
                 # This is probably a binary program instead
                 # of a script, so just ignore it.
                 continue
-        finally:
-            f.close()
         if not lines:
-            logger.warn('Script %s is an empty file' % filename)
+            logger.warn("Script %s is an empty file", filename)
             continue
-        if not lines[0].strip().startswith(shebang):
+
+        old_shebang = lines[0].strip()
+        old_shebang = old_shebang[0:2] + os.path.normcase(old_shebang[2:])
+
+        if not old_shebang.startswith(shebang):
             if os.path.basename(filename) in OK_ABS_SCRIPTS:
-                logger.debug('Cannot make script %s relative' % filename)
+                logger.debug("Cannot make script %s relative", filename)
             elif lines[0].strip() == new_shebang:
-                logger.info('Script %s has already been made relative' % filename)
+                logger.info("Script %s has already been made relative", filename)
             else:
-                logger.warn('Script %s cannot be made relative (it\'s not a normal script that starts with %s)'
-                            % (filename, shebang))
+                logger.warn(
+                    "Script %s cannot be made relative (it's not a normal script that starts with %s)",
+                    filename,
+                    shebang,
+                )
             continue
-        logger.notify('Making script %s relative' % filename)
-        lines = [new_shebang+'\n', activate+'\n'] + lines[1:]
-        f = open(filename, 'wb')
-        f.write('\n'.join(lines).encode('utf-8'))
-        f.close()
+        logger.notify("Making script %s relative", filename)
+        script = relative_script([new_shebang] + lines[1:])
+        with open(filename, "wb") as f:
+            f.write("\n".join(script).encode("utf-8"))
+
+
+def relative_script(lines):
+    """Return a script that'll work in a relocatable environment."""
+    activate = (
+        "import os; "
+        "activate_this=os.path.join(os.path.dirname(os.path.realpath(__file__)), 'activate_this.py'); "
+        "exec(compile(open(activate_this).read(), activate_this, 'exec'), { '__file__': activate_this}); "
+        "del os, activate_this"
+    )
+    # Find the last future statement in the script. If we insert the activation
+    # line before a future statement, Python will raise a SyntaxError.
+    activate_at = None
+    for idx, line in reversed(list(enumerate(lines))):
+        if line.split()[:3] == ["from", "__future__", "import"]:
+            activate_at = idx + 1
+            break
+    if activate_at is None:
+        # Activate after the shebang.
+        activate_at = 1
+    return lines[:activate_at] + ["", activate, ""] + lines[activate_at:]
+
 
 def fixup_pth_and_egg_link(home_dir, sys_path=None):
     """Makes .pth and .egg-link files use relative paths"""
     home_dir = os.path.normcase(os.path.abspath(home_dir))
     if sys_path is None:
         sys_path = sys.path
-    for path in sys_path:
-        if not path:
-            path = '.'
-        if not os.path.isdir(path):
+    for a_path in sys_path:
+        if not a_path:
+            a_path = "."
+        if not os.path.isdir(a_path):
             continue
-        path = os.path.normcase(os.path.abspath(path))
-        if not path.startswith(home_dir):
-            logger.debug('Skipping system (non-environment) directory %s' % path)
+        a_path = os.path.normcase(os.path.abspath(a_path))
+        if not a_path.startswith(home_dir):
+            logger.debug("Skipping system (non-environment) directory %s", a_path)
             continue
-        for filename in os.listdir(path):
-            filename = os.path.join(path, filename)
-            if filename.endswith('.pth'):
+        for filename in os.listdir(a_path):
+            filename = os.path.join(a_path, filename)
+            if filename.endswith(".pth"):
                 if not os.access(filename, os.W_OK):
-                    logger.warn('Cannot write .pth file %s, skipping' % filename)
+                    logger.warn("Cannot write .pth file %s, skipping", filename)
                 else:
                     fixup_pth_file(filename)
-            if filename.endswith('.egg-link'):
+            if filename.endswith(".egg-link"):
                 if not os.access(filename, os.W_OK):
-                    logger.warn('Cannot write .egg-link file %s, skipping' % filename)
+                    logger.warn("Cannot write .egg-link file %s, skipping", filename)
                 else:
                     fixup_egg_link(filename)
 
+
 def fixup_pth_file(filename):
     lines = []
-    prev_lines = []
-    f = open(filename)
-    prev_lines = f.readlines()
-    f.close()
+    with open(filename) as f:
+        prev_lines = f.readlines()
     for line in prev_lines:
         line = line.strip()
-        if (not line or line.startswith('#') or line.startswith('import ')
-            or os.path.abspath(line) != line):
+        if not line or line.startswith("#") or line.startswith("import ") or os.path.abspath(line) != line:
             lines.append(line)
         else:
             new_value = make_relative_path(filename, line)
             if line != new_value:
-                logger.debug('Rewriting path %s as %s (in %s)' % (line, new_value, filename))
+                logger.debug("Rewriting path {} as {} (in {})".format(line, new_value, filename))
             lines.append(new_value)
     if lines == prev_lines:
-        logger.info('No changes to .pth file %s' % filename)
+        logger.info("No changes to .pth file %s", filename)
         return
-    logger.notify('Making paths in .pth file %s relative' % filename)
-    f = open(filename, 'w')
-    f.write('\n'.join(lines) + '\n')
-    f.close()
+    logger.notify("Making paths in .pth file %s relative", filename)
+    with open(filename, "w") as f:
+        f.write("\n".join(lines) + "\n")
+
 
 def fixup_egg_link(filename):
-    f = open(filename)
-    link = f.read().strip()
-    f.close()
+    with open(filename) as f:
+        link = f.readline().strip()
     if os.path.abspath(link) != link:
-        logger.debug('Link in %s already relative' % filename)
+        logger.debug("Link in %s already relative", filename)
         return
     new_link = make_relative_path(filename, link)
-    logger.notify('Rewriting link %s in %s as %s' % (link, filename, new_link))
-    f = open(filename, 'w')
-    f.write(new_link)
-    f.close()
+    logger.notify("Rewriting link {} in {} as {}".format(link, filename, new_link))
+    with open(filename, "w") as f:
+        f.write(new_link)
+
 
 def make_relative_path(source, dest, dest_is_directory=True):
     """
@@ -1687,6 +2056,8 @@
     if not dest_is_directory:
         dest_filename = os.path.basename(dest)
         dest = os.path.dirname(dest)
+    else:
+        dest_filename = None
     dest = os.path.normpath(os.path.abspath(dest))
     source = os.path.normpath(os.path.abspath(source))
     dest_parts = dest.strip(os.path.sep).split(os.path.sep)
@@ -1694,20 +2065,20 @@
     while dest_parts and source_parts and dest_parts[0] == source_parts[0]:
         dest_parts.pop(0)
         source_parts.pop(0)
-    full_parts = ['..']*len(source_parts) + dest_parts
-    if not dest_is_directory:
+    full_parts = [".."] * len(source_parts) + dest_parts
+    if not dest_is_directory and dest_filename is not None:
         full_parts.append(dest_filename)
     if not full_parts:
         # Special case for the current directory (otherwise it'd be '')
-        return './'
+        return "./"
     return os.path.sep.join(full_parts)
 
 
+FILE_PATH = __file__ if os.path.isabs(__file__) else os.path.join(os.getcwd(), __file__)
 
-############################################################
-## Bootstrap script creation:
 
-def create_bootstrap_script(extra_text, python_version=''):
+# Bootstrap script creation:
+def create_bootstrap_script(extra_text, python_version=""):
     """
     Creates a bootstrap script, which is like this script but with
     extend_parser, adjust_options, and after_install hooks.
@@ -1742,533 +2113,522 @@
         This example immediately installs a package, and runs a setup
         script from that package.
 
-    If you provide something like ``python_version='2.4'`` then the
-    script will start with ``#!/usr/bin/env python2.4`` instead of
+    If you provide something like ``python_version='2.5'`` then the
+    script will start with ``#!/usr/bin/env python2.5`` instead of
     ``#!/usr/bin/env python``.  You can use this when the script must
     be run with a particular Python version.
     """
-    filename = __file__
-    if filename.endswith('.pyc'):
+    filename = FILE_PATH
+    if filename.endswith(".pyc"):
         filename = filename[:-1]
-    f = open(filename, 'rb')
-    content = f.read()
-    f.close()
-    py_exe = 'python%s' % python_version
-    content = (('#!/usr/bin/env %s\n' % py_exe)
-               + '## WARNING: This file is generated\n'
-               + content)
-    return content.replace('##EXT' 'END##', extra_text)
+    with codecs.open(filename, "r", encoding="utf-8") as f:
+        content = f.read()
+    py_exe = "python{}".format(python_version)
+    content = "#!/usr/bin/env {}\n# WARNING: This file is generated\n{}".format(py_exe, content)
+    # we build the string as two, to avoid replacing here, but yes further done
+    return content.replace("# EXTEND - " "bootstrap here", extra_text)
 
-##EXTEND##
+
+# EXTEND - bootstrap here
+
 
 def convert(s):
-    b = base64.b64decode(s.encode('ascii'))
-    return zlib.decompress(b).decode('utf-8')
+    b = base64.b64decode(s.encode("ascii"))
+    return zlib.decompress(b).decode("utf-8")
 
-##file site.py
-SITE_PY = convert("""
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-""")
-
-##file ez_setup.py
-EZ_SETUP_PY = convert("""
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-""")
 
-##file distribute_setup.py
-DISTRIBUTE_SETUP_PY = convert("""
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-""")
-
-##file activate.sh
-ACTIVATE_SH = convert("""
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-+u3AjQtC5l1l7QV1dBAcadt+7UhFGpXONprZRviAWtbY3dgZ3N4P2ePT9OFxdjJiruJSuLk7+31f
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-+IyoWBSfhOIIIoRar657vSzLLj9Q0xRZX9Kk6SUq0BmPsceNl179Mi8Vii65Pkj21XXf4MAlSy/t
-Exft7A8WX4/iVRkZprZfNK2/YFL/55T+9wm9m86Uhr8A0Hwt
-""")
-
-##file activate.fish
-ACTIVATE_FISH = convert("""
-eJydVm1v4jgQ/s6vmA1wBxUE7X2stJVYlVWR2lK13d6d9laRk0yIr8HmbIe0++tvnIQQB9pbXT5A
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-djvPTWZT4S3NT5aVLgurMPUWI07BRVYqkQrmtCKohNY8qu9EdACoT6ki0a66XxVF4f9AQ3W38yO5
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-jJa65e+eE2Ya30E2GurxUP8ssA6e/wOnvo3V78d3vTcvMB3n7l3iX1JXWqk=
-""")
+# file site.py
+SITE_PY = convert(
+    """
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+W9QaQroM1UwOGYPCH3K4MUA6xYwZ+cZj7VRYQxH8Pz99ANE=
+"""
+)
 
-##file activate.csh
-ACTIVATE_CSH = convert("""
-eJx9U11vmzAUffevOCVRu+UB9pws29Kl0iq1aVWllaZlcgxciiViItsQdb9+xiQp+dh4QOB7Pu49
-XHqY59IgkwVhVRmLmFAZSrGRNkdgykonhFiqSCRW1sJSmJg8wCDT5QrucRCyHn6WFRKhVGmhKwVp
-kUpNiS3emup3TY6XIn7DVNQyJUwlrgthJD6n/iCNv72uhCzCpFx9CRkThRQGKe08cWXJ9db/yh/u
-pvzl9mn+PLnjj5P5D1yM8QmXlzBkSdXwZ0H/BBc0mEo5FE5qI2jKhclHOOvy9HD/OO/6YO1mX9vx
-sY0H/tPIV0dtqel0V7iZvWyNg8XFcBA0ToEqVeqOdNUEQFvN41SumAv32VtJrakQNSmLWmgp4oJM
-yDoBHgoydtoEAs47r5wHHnUal5vbJ8oOI+9wI86vb2d8Nrm/4Xy4RZ8R85E4uTZPB5EZPnTaaAGu
-E59J8BE2J8XgrkbLeXMlVoQxznEYFYY8uFFdxsKQRx90Giwx9vSueHP1YNaUSFG4vTaErNSYuBOF
-lXiVyXa9Sy3JdClEyK1dD6Nos9mEf8iKlOpmqSNTZnYjNEWiUYn2pKNB3ttcLJ3HmYYXy6Un76f7
-r8rRsC1TpTJj7f19m5sUf/V3Ir+x/yjtLu8KjLX/CmN/AcVGUUo=
-""")
+# file activate.sh
+ACTIVATE_SH = convert(
+    """
+eJytVW1P2zAQ/u5fcaQVG9s6VvjGVLQyKoEELWo6JjZQMMmVWEudynYK5eW/75w3kgbYh9EPbe27
+s5977p5zCyah0DAVEcIs0QauEBKNAdwIE4Kj40T5CFdCbnLfiAU36MCHqYpncMV1+IG1YBkn4HMp
+YwMqkSAMBEKhb6IlY0xM4Tc47fu9vnvguaMf4++DzqMDPdr74sDFVzAhSgb0QT+MwTmjw1IY+cXG
+gtO+EnOzA+ftYtsG765vZYG3dOX2NpsKxgIsUML7DbhP7YnUaKAzhfkyiH3Y3QxwsSmTKIKt3fUu
+S31aoNB6xVEAKBdCxXKG0sCCK8GvItS51xpl07mD9v1pf/zRe4QLijOJkhqMShAoWzIAQQ7Qj7gi
+GrkBHkVpOFnzeCLEGx3te6eH48mP/pF30p8c7NB5xAhUKLEfa+o57Ya7U3rg7TxWJnUs97KcG0Gp
+nXj6B5qzycFoeDA6HrwAqbQ3gJWWJrzS9CrIupctaUZ82qQ6jBMqUICG2ivtP+AygDsdfoKbUPgh
+hHyBwOmHTH48m1mzCakGtqfyo6jBfSoJ1cbEcE0IqH3o3zRWdjHn1Hx5qP4M8JNkECcmNxshr/Nj
+ao6WIGhbisEPubxGDTekJx7YryVYbdC11GNzQo5BUQCiXxbq6KRUPzyUm79IMaeDsXs4GnaeK0Oa
+ZEdRF5cdXSPtlQK73Rcq63YbJXW7zVq63VeLmJsLIJlLYR0MT5/SX7PYuvlEkLEMUJOQrIRxBV4L
+XIymUDisrQDoWFOh/eL2R0bjKbMLpTDCBa9pujIt6nczVkHbczyvsvQ8h+U8VFNiDbERk5lQ80XF
+e9Pz9g6H3rB/PPC8ndytquMS95MgLGG0w2plfU2qLwjLwlqR6epV6SjN2jO9pZr9/qHb3zsaeCfj
+0fHJpNGYq43QsyBdW+Gnoju3T4RmxxCnsNaD2xc6suleOxQjjfWA95c0HFDyGcJ5jfhz53IDasH5
+NKx0tk2+Bcf8D4JOFNrZkEgeCa7zF4SSEOadprmukAdLC1ghq3pUJFl9b9bXV04itdt3g7FsWT5Z
+8yUNHQmdWe7ntL85WTe/yRx8gxn4n/Pvf2bfc3OPavYXWw6XFQ==
+"""
+)
 
-##file activate.bat
-ACTIVATE_BAT = convert("""
-eJyFUkEKgzAQvAfyhz0YaL9QEWpRqlSjWGspFPZQTevFHOr/adQaU1GaUzI7Mzu7ZF89XhKkEJS8
-qxaKMMsvboQ+LxxE44VICSW1gEa2UFaibqoS0iyJ0xw2lIA6nX5AHCu1jpRsv5KRjknkac9VLVug
-sX9mtzxIeJDE/mg4OGp47qoLo3NHX2jsMB3AiDht5hryAUOEifoTdCXbSh7V0My2NMq/Xbh5MEjU
-ZT63gpgNT9lKOJ/CtHsvT99re3pX303kydn4HeyOeAg5cjf2EW1D6HOPkg9NGKhu
-""")
+# file activate.fish
+ACTIVATE_FISH = convert(
+    """
+eJytVm1v2zYQ/q5fcZUdyClqGVuHfQgwDGnjIQYSO3DcAMM6yLREWxxo0iMpty7243ekLImy5RQY
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+HaFntuLSEoJ5x7NQw1nr2NkOqV3T+g3qIQ54ubrXgp0032bvamC6yP4kaNfx/wIsXsYv
+"""
+)
 
-##file deactivate.bat
-DEACTIVATE_BAT = convert("""
-eJxzSE3OyFfIT0vj4spMU0hJTcvMS01RiPf3cYkP8wwKCXX0iQ8I8vcNCFHQ4FIAguLUEgWIgK0q
-FlWqXJpcICVYpGzx2BAZ4uHv5+Hv6wq1BWINXBTdKriEKkI1DhW2QAfhttcxxANiFZCBbglQSJUL
-i2dASrm4rFz9XLgAwJNbyQ==
-""")
+# file activate.csh
+ACTIVATE_CSH = convert(
+    """
+eJx9VNtO4zAQffdXDKEiUEFhX8t22bJFWqRyEVuQVkKy3Hi6sZQ44Dit+sK379hJittG5KGqPZdz
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+3Jy2CtGCf0rca/tp+N4BXqsflKquRr0L2sjmuClOu+/8/NKvTQsNZ3l9ZqxeTew//1a6EA==
+"""
+)
 
-##file activate.ps1
-ACTIVATE_PS = convert("""
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-00Fube5O+iyCtHDs9BfPfz3q4sfFv9d91Ljhfy7ei0VO+nVTtdOkv/jpt0l2AX6iG1jXgKnnDuD4
-ke2k/i8fzzz5UedkVcP4pwF+Wvz2FJl+3vt598urXf5Y6LNA5WcFOP7r0sW7b9a+W/xcu0Xpv5zk
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-e5n/y5/Y5LPPfdrqb88ga/PabxZRVfmp39l588m/6u+/e+OpP+dF7n1WZpJ9//Z4v372fDDz9eHB
-7Juvs/BLMHzrxL9+9twXpJfhd1/DrpQ5Euu/vlss3wp9HXC/54C/Ld69m6zwdx3tC0d8daSv0V8B
-n4b9YYF53sJelJV/ix6LZspw/sJtqyl5LJ5r/23htA1Imfm/gt9R7dqVB1LjhydAX4Gb+zksQF59
-9+P7H//U+376afFuvh2/T6P85Xr/5c8C6OXyFY4BGuN+EE0+GeR201b+wkkLN5mmBY5TfMw8ngqL
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-/hhwJCZhGI5jt5FsAkOrObVyE6g2y1snyhMGFlDY1x+BoHpCMulTj5JYWNAYJmnKpvLxXgmQ8az1
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-eaEbJ8XpyO8CeD9QJc8nbLP2C2R3A437ISUNyt5Yd0TbDNcl11/DSsOzdbi/VhCC0KE6v1vqVNkq
-45ZnG6fiV2NwzInxCNth3BwL0+8814jE6+1W1EeWtpWbSZJOJNYXmWRXa7vLnAljE692eHjZ4y5u
-y1u63De0IzKca7As48Z3XshVF+3XiLNz0JIMh/JOpbiNLlMi672uO0wYzOCZjRxcxj3D+gVenGIE
-MvFUGGXuRps2RzMcgWIRolHXpGUP6sMsQt1hspUBnVKUn/WQj2u6j3SXd9Xz0QtEzoM7qTu5y7gR
-q9gNNsrlEMLdikBt9bFvBnfbUIh6voTw7eDsyTmPKUvF0bHqWLbHe3VRHyRZnNeSGKsB73q66Vsk
-taxWYmwz1tYVFG/vOQhlM0gUkyvIab3nv2caJ1udU1F3pDMty7stubTE4OJqm0i0ECfrJIkLtraC
-HwRWKzlqpfhEIqYH09eT9WrOhQyt8YEoyBlnXtAT37WHIQ03TIuEHbnRxZDdLun0iok9PUC79prU
-m5beZzfQUelEXnhzb/pIROKx3F7qCttYIFGh5dXNzFzID7u8vKykA8Uejf7XXz//S4nKvW//ofS/
-QastYw==
-""")
+# file activate.xsh
+ACTIVATE_XSH = convert(
+    """
+eJyNU11PwjAUfe+vuNY9sIj7ASQ+YCSBRD6i02gIaSq7gyWjXdqyaIz/3XYwVmB+9GFZ78c57T2n
+lNIXKfQa+NJkJTcIeqmywkAqFZSZMlueoygppSRVcgPvrjgyUuYask0hlYEVGqaxAK6B7f8JSTAF
+lmCN2uFqpcMeAbuyFGjxkcglhUwAzzOuUe9SbiWY18H5vm5B6sbgM4qir8jSdCib3t+x59FD/NS/
+Z7N+PKRdoDRskAIXhBsIziqPyFrSf9O9xsPpZDgdD85JD6lz6kPqtwM0RYdx1bnB5Lka2u5cxzML
+vKLWTjZ7mI5n8b8A9rUNjpAiQW3U1gmKFIQ0lXpW1gblEh4xT6EuvGjXtHGFE5ZcwlZotGhKYY4l
+FwZKrjL+lqMmvoXmp4dYhKQV1M7d6yPEv5jNKcqYf1VGbcmZB5x4lRcCfzfvLXaBiCdJ5wj46uD+
+Tmg3luR2NGGT/nhgGbpgX48wN7HaYhcUFjlfYrULCTkxWru36jF59rJ9NlJlf7JQde5j11VS+yZr
+0d22eUPaxdycLKMTvqWjR3610emDtgTu36ylcJe83rhv/di/AYN1UZY=
+"""
+)
+
+# file activate.bat
+ACTIVATE_BAT = convert(
+    """
+eJyVk1FLhEAUhd8X/A8XWSkf28dCyMUpBR3FzAiCS+WYwq4TOdXfb0Z3dTJdyCfveO85n8frNXut
+OPCyNFbGqmUCzDxIs3s3REJzB1GrEE3VVJdQsLJuWAEYh97QkaRxlGRwbqxAXp1Uf+RYM32W1LKB
+7Vp2nJC6DReD9m+5qeQ6Wd+a/SN7dlzn9oI7dxsSXJCcoXOskfLgYXdv/j8LnXiM8iGg/RmiZmOr
+bFMSgcebMwGfKhgbBIfnL14X8P7BX3Zs38J3LSoQFdtD3YCVuJlvnfgmj5kfUz+OCLxxqUWoF9zk
+qtYAFyZkBsO9ArzUh/td0ZqP9IskElTFMsnwb4/GqeoLPUlZT5dJvf8Id5hQIONynUSa2G0Wc+m8
+Z+w2w4/Tt2hbYT0hbgOK1I0I4tUw/QOTZfLE
+"""
+)
+
+# file deactivate.bat
+DEACTIVATE_BAT = convert(
+    """
+eJyFkN0KgkAUhO8F32EQpHqFQEjQUPAPMaErqVxzId3IrV6/3ST/UDp3c86c4WN25FIysKJQFVVp
+CEfqxsnB9DI7SA25i20fFqtXHM+GYL0BZzi9GM1xf7DzjVQN3pSX4CWpQGvokZk4uqrQAjXjyElB
+a5IjCz0r+2VHcehHCa5MZNmB5e7TdqMqECMptHZh6DN/utb7Zs6CejsO/QNzTJwwcELfHgJJPcTp
+TFOk7rCM1f92aG38HzBR5KgjoYdIQk5hZPWLGNLfd/MN+wANyJE5
+"""
+)
 
-##file distutils-init.py
-DISTUTILS_INIT = convert("""
-eJytV92L4zYQf/dfMU0ottuse7RvC6FQrg8Lxz2Ugz4si9HacqKuIxlJ2ST313dG8odkO9d7aGBB
-luZLv/nNjFacOqUtKJMIvzK3cXlhWgp5MDBsqK5SNYftsBAGpLLA4F1oe2Ytl+9wUvW55TswCi4c
-KibhbFDSglXQCFmDPXIwtm7FawLRbwtPzg2T9gf4gupKv4GS0N262w7V0NvpbCy8cvTo3eAus6C5
-ETU3ICQZX1hFTw/dzR6V/AW1RCN4/XAtbsVXqIXmlVX6liS4lOzEYY9QFB2zx6LfoSNjz1a0pqT9
-QOIfJWQ2E888NEVZNqLlZZnvIB0NpHkimlFdKn2iRRY7yGG/CCJb6Iz280d34SFXBS2yEYPNF0Q7
-yM7oCjpWvbEDQmnhRwOs6zjThpKE8HogwRAgraqYFZgGZvzmzVh+mgz9vskT3hruwyjdFcqyENJw
-bbMPO5jdzonxK68QKT7B57CMRRG5shRSWDTX3dI8LzRndZbnSWL1zfvriUmK4TcGWSnZiEPCrxXv
-bM+sP7VW2is2WgWXCO3sAu3Rzysz3FiNCA8WPyM4gb1JAAmCiyTZbhFjWx3h9SzauuRXC9MFoVbc
-yNTCm1QXOOIfIn/g1kGMhDUBN72hI5XCBQtIXQw8UEEdma6Jaz4vJIJ51Orc15hzzmu6TdFp3ogr
-Aof0c98tsw1SiaiWotHffk3XYCkqdToxWRfTFXqgpg2khcLluOHMVC0zZhLKIomesfSreUNNgbXi
-Ky9VRzwzkBneNoGQyyvGjbsFQqOZvpWIjqH281lJ/jireFgR3cPzSyTGWzQpDNIU+03Fs4XKLkhp
-/n0uFnuF6VphB44b3uWRneSbBoMSioqE8oeF0JY+qTvYfEK+bPLYdoR4McfYQ7wMZj39q0kfP8q+
-FfsymO0GzNlPh644Jje06ulqHpOEQqdJUfoidI2O4CWx4qOglLye6RrFQirpCRXvhoRqXH3sYdVJ
-AItvc+VUsLO2v2hVAWrNIfVGtkG351cUMNncbh/WdowtSPtCdkzYFv6mwYc9o2Jt68ud6wectBr8
-hYAulPSlgzH44YbV3ikjrulEaNJxt+/H3wZ7bXSXje/YY4tfVVrVmUstaDwwOBLMg6iduDB0lMVC
-UyzYx7Ab4kjCqdViEJmDcdk/SKbgsjYXgfMznUWcrtS4z4fmJ/XOM1LPk/iIpqass5XwNbdnLb1Y
-8h3ERXSWZI6rZJxKs1LBqVH65w0Oy4ra0CBYxEeuOMbDmV5GI6E0Ha/wgVTtkX0+OXvqsD02CKLf
-XHbeft85D7tTCMYy2Njp4DJP7gWJr6paVWXZ1+/6YXLv/iE0M90FktiI7yFJD9e7SOLhEkkaMTUO
-azq9i2woBNR0/0eoF1HFMf0H8ChxH/jgcB34GZIz3Qn4/vid+VEamQrOVqAPTrOfmD4MPdVh09tb
-8dLLjvh/61lEP4yW5vJaH4vHcevG8agXvzPGoOhhXNncpTr99PTHx6e/UvffFLaxUSjuSeP286Dw
-gtEMcW1xKr/he4/6IQ6FUXP+0gkioHY5iwC9Eyx3HKO7af0zPPe+XyLn7fAY78k4aiR387bCr5XT
-5C4rFgwLGfMvJuAMew==
-""")
+# file activate.ps1
+ACTIVATE_PS = convert(
+    """
+eJytVU1v4jAQvftXTNNoF9QNvSP1kG6RikQpIiyX3ZXlJkOx5NiR46RFK/77Oh+QkEBVrXYOSPZ8
++L2ZN8FNQ80TM149TgO68FePcAduvOMyVyEzXMlRvAtVHDMZjRJmtsStE+79YEIfpksbHySCG29h
+vTBYYqpEjtXJcY9lb0cjZwj2WqM0hGwyGRbV4VWoFybGETJ7zpnBwc/0jZtw+xvcuZIPmBqdFS4c
+wh8C1vgGBit7XT2RM83Zi8AxfZ490PV0ufrhz8oXD/GFuSjz8YHd5ZRj/BJjZUms60hweqEOeEGo
+EqwJlJl7cgbggemYKhHRnGuTMUETreLEnEA8Bla+AulHuV2sU4Nx89ivSxktjGVTDpwm83UbTbto
+Jwy8idZK+9X8Ai7sQMXuu5KGywy7j1xdmGJh1xCg2EBUe68+ptRI5OO4ZBepsIax7yutdNcgkp3Z
+Wo8XQ3XrMv2aFknXkMkUDXCtUWDOpDkKLSUNEPCkklFDjhC33Sg7wcOWkG6zC2frSMgc3xq9nWgL
+vDmLEXoSBBsvMmzETUhb5073yVtK76dzOvefJtRaEUaDyYJSB25aRaqpdXIth8C/n03oYvn8tFgd
+ptht7hnVtebtOPVYTvV+Lumutw+NpBzatKFEUzDwpN1Sp62u3uC7cCoJ+lEEZosQZqlRVggaN/wd
+jCov8Z2nVtav0Nm5koANzbnK0hozzctp3MGXTy5uYefJ3FwoPjzm7ludRJHiv/FmHbphpovPc832
+G7xkBiIlv9pfnoZMR8DN6P83wZX41s13Bu6g/cfS2x9vhmwDwyE4pw3tF/t8N/fkLzQ3ME8=
+"""
+)
 
-##file distutils.cfg
-DISTUTILS_CFG = convert("""
+# file distutils-init.py
+DISTUTILS_INIT = convert(
+    """
+eJytV21v5DQQ/p5fMaRCJLANcAcSqlghuBdUcRzo6BdUnSI3cXZNs3bO9m679+uZsbOJnWR7fKBS
+u65nPC/PvK7YdUpbUCYR/mSOw/GBaSnkxiTJBaiuUjUHYUAqCwwOQts9a7k8wE7V+5avwCh44FAx
+CXuDnBasgkbIGuyWg7F1K+5Q0LWTzaT9DG7wgdL3oCR0x+64QkaUv9sbC3ccdXjBeMssaG5EzQ0I
+SeJQDkq77I52q+TXyCcawevLx+JYfIRaaF5ZpY8nP7ztSYIEyXYc1uhu0TG7LfobIhm7t6I1Jd0H
+HP8oIbMJe+YFFmXZiJaXZb6CdBCQ5olohudS6R0dslhBDuuZEdnszSA/v0oAf07xKOiQpTcIaxCG
+QQN0rLpnG0TQwucGWNdxpg1FA1H1+IEhHFpVMSsQfWb85dFYvhsF/YS+8NZwr710lpdlIaTh2mbf
+rGDqFFxgdnxgV/D6h2ffukcIBUotDlwbVFQK2Sj4EbLnK/iud8px+TjhRzLcac7acvRpTdSiVawu
+fVpkaTk6PzKmK3irJJ/atoIsRRL9kpw/f/u1fHn97tWLmz/e/Z3nTunoaWwSfmCuFTtWbYXkmFUD
+z9NJMzUgLdF9YRHA7pjmgxByiWvv31RV8Zfa64q/xix449jOOz0JxejH2QB8HwQg8NgeO26SiDIL
+heMpfndxuMFz5p0oKI1H1TGgi6CSwFiX6XgVgUEsBd2WjVa70msKFa56CPOnbZ5I9EnkZZL0jP5M
+o1LwR9Tb51ssMfdmX8AL1R1d9Wje8gP2NSw7q8Xd3iKMxGL1cUShLDU/CBeKEo2KZRYh1efkY8U7
+Cz+fJL7SWulRWseM6WvzFOBFqQMxScjhoFX0EaGLFSVKpWQjNuSXMEi4MvcCa3Jw4Y4ZbtAWuUl6
+095iBAKrRga0Aw80OjAhqy3c7UVbl/zRwlgZUCtu5BcW7qV6gC3+YpPacOvwxFCZoJc7OVuaFQ84
+U9SDgUuaMVuma2rGvoMRC3Y8rfb92HG6ee1qoNO8EY8YuL4mupbZBnst9eIUhT5/lnonYoyKSu12
+TNbF6EGP2niBDVThcbjwyVG1GJ+RK4tYguqreUODkrXiIy9VRy3ZZIa3zbRC0W68LRAZzfQRQ4xt
+HScmNbyY01XSjHUNt+8jNt6iSMw3aXAgVzybPVkFAc3/m4rZHRZvK+xpuhne5ZOKnz0YB0zUUClm
+LrV9ILGjvsEUSfO48COQi2VYkyfCvBjc4Z++GXgB09sgQ9YQ5MJFoIVOfVaaqyQha2lHKn3huYFP
+KBJb8VIYX/doeTHjSnBr8YkT34eZ07hCWMOimh6LPrMQar8cYTF0yojHdIw37nPavenXpxRHWABc
+s0kXJujs0eKbKdcs4qdgR4yh1Y5dGCJlMdNoC5Y5NgvcbXD9adGIzAEzLy/iKbiszYPA/Wtm8UIJ
+OEGYljt14Bk9z5OYROuXrLMF8zW3ey09W+JX0E+EHPFZSIMwvcYWHucYNtXSb8u4AtCAHRiLmNRn
+1UCevMyoabqBiRt3tcYS9fFZUw/q4UEc/eW8N/X3Tn1YyyEec3NjpSeVWMXJOTNx5tWqcsNwLu5E
+TM5hEMJTTuGZyMPGdQ5N+r7zBJpInqNJjbjGkUbUs+iGTEAt63+Ee2ZVbNMnwacF6yz4AXEZ/Ama
+5RTNk7yefGB+5ESiAtoi/AE9+5LpjemBdfj0Ehf09Lzht5qzCwT9oL00zZZaWjzEWjfEwoU9mMiD
+UbThVzZ34U7fXP+C315S91UcO9rAFLen4fr29OA9WnOyC1c8Zu5xNaLeyNo2WNvPmkCtc2ICqidc
+zmg+LaPu/BXc9srfx9pJbJiSw5NZkgXxWMiyBWpyNjdmeRbmzb+31cHS
+"""
+)
+
+# file distutils.cfg
+DISTUTILS_CFG = convert(
+    """
 eJxNj00KwkAMhfc9xYNuxe4Ft57AjYiUtDO1wXSmNJnK3N5pdSEEAu8nH6lxHVlRhtDHMPATA4uH
 xJ4EFmGbvfJiicSHFRzUSISMY6hq3GLCRLnIvSTnEefN0FIjw5tF0Hkk9Q5dRunBsVoyFi24aaLg
 9FDOlL0FPGluf4QjcInLlxd6f6rqkgPu/5nHLg0cXCscXoozRrP51DRT3j9QNl99AP53T2Q=
-""")
+"""
+)
+
+# file activate_this.py
+ACTIVATE_THIS = convert(
+    """
+eJylVE1v2zAMvetXENqh9pZ5wHYL0EMOBdqh64It7RAEhaE4TKzOlgxJ+ULR/15Sdhr341BsOcSW
+9fj4SD5JSjkqgt6ogLDRLqxVhWYDS+ugWDuHJoA2AV3jkP6HQlx7BNxhkdgGTRJK7fOlrjDNHKpF
+kg7g/iSPX/L8ZAhP+w9pJsSEVlAoA3OEtccFbEs0sLdrqNc+8CegTdxpH7RZwXgfSmv6+QdgbCDS
+Z1rn2nxpIjQTUkqh68a6ANYf3rwO+PS+90IEtx8KoN9BqcBdgU2AK1XjmXPWtdtOaZI08h5d0NbE
+nURO+3r/qRWpTIX4AFQTBS64AAgWxqPJOUQaYBjQUxuvFxgLZtBCOyyCdftU0DKnJZxSnVmjQpnR
+ypD85LBWc8/P5CAhTQVtUcO0s2YmOZu8PcZ7bLI7q00y66hv4RMcA7IVhqQNGoCUaeabSofkGEz0
+Yq6oI68VdYSx5m5uwIOjAp1elQHU3G5eVPhM683Fr8n16DI/u7qJkjkPk6nFom8G6AJqcq2PU//c
+qOKvWiG3l4GlpbE1na1aQ9RYlMpoX4uL3/l4Op4Sf6m8CsElZBYqttk3+3yDzpMFcm2WlqZH2O/T
+yfnPK0ITKmsqFejM1JkPygW/1dR4eac2irB6CU/w1lcsLe+k+V7DYv+5OMp6qefc6X4VnsiwaulY
+6fvJXrN4bKOJ6s/Fyyrg9BTkVptvX2UEtSkJ18b8ZwkcfhTwXrKqJWuHd/+Q3T/IjLWqkHxk7f0B
+pW9kFXTaNlwn+TjWSglSwaiMbMRP8l7yTAltE5AOc5VT8FLvDm2KC3F87VnyBzuZrUakdMERXe0P
+7luSN+leWsYF5x/QAQdqeoHC4JZYKrr5+uq6t9mQXT/T8VrWHMRwmoqO9yGTUHF8YN/EHPbFI/bz
+/no=
+"""
+)
+
+# file python-config
+PYTHON_CONFIG = convert(
+    """
+eJyNVV1P2zAUfc+v8ODBiSABxlulTipbO6p1LWqBgVhlhcZpPYUkctzSivHfd6+dpGloGH2Ja/ue
+e+65Hz78xNhtf3x90xmw7vCWsRPGLvpDNuz87MKfdKMWSWxZ4ilNpCLZJiuWc66SVFUOZkkcirll
+rfxIBAzOMtImDzSVPBRrekwoX/OZu/0r4lm0DHiG60g86u8sjPw5rCyy86NRkB8QuuBRSqfAKESn
+3orLTCQxE3GYkC9tYp8fk89OSwNsmXgizrhUtnumeSgeo5GbLUMk49Rv+2nK48Cm/qMwfp333J2/
+dVcAGE0CIQHBsgIeEr4Wij0LtWDLzJ9ze5YEvH2WI6CHTAVcSu9ZCsXtgxu81CIvp6/k4eXsdfo7
+PvDCRD75yi41QitfzlcPp1OI7i/1/iQitqnr0iMgQ+A6wa+IKwwdxyk9IiXNAzgquTFU8NIxAVjM
+osm1Zz526e+shQ4hKRVci69nPC3Kw4NQEmkQ65E7OodxorSvxjvpBjQHDmWFIQ1mlmzlS5vedseT
+/mgIEsMJ7Lxz2bLAF9M5xeLEhdbHxpWOw0GdkJApMVBRF1y+a0z3c9WZPAXGFcFrJgCIB+024uad
+0CrzmEoRa3Ub4swNIHPGf7QDV+2uj2OiFWsChgCwjKqN6rp5izpbH6Wc1O1TclQTP/XVwi6anTr1
+1sbubjZLI1+VptPSdCfwnFBrB1jvebrTA9uUhU2/9gad7xPqeFkaQcnnLbCViZK8d7R1kxzFrIJV
+8EaLYmKYpvGVkig+3C5HCXbM1jGCGekiM2pRCVPyRyXYdPf6kcbWEQ36F5V4Gq9N7icNNw+JHwRE
+LTgxRXACpvnQv/PuT0xCCAywY/K4hE6Now2qDwaSE5FB+1agsoUveYDepS83qFcF1NufvULD3fTl
+g6Hgf7WBt6lzMeiyyWVn3P1WVbwaczHmTzE9A5SyItTVgFYyvs/L/fXlaNgbw8v3azT+0eikVlWD
+/vBHbzQumP23uBCjsYdrL9OWARwxs/nuLOzeXbPJTa/Xv6sUmQir5pC1YRLz3eA+CD8Z0XpcW8v9
+MZWF36ryyXXf3yBIz6nzqz8Muyz0m5Qj7OexfYo/Ph3LqvkHUg7AuA==
+"""
+)
+
+MH_MAGIC = 0xFEEDFACE
+MH_CIGAM = 0xCEFAEDFE
+MH_MAGIC_64 = 0xFEEDFACF
+MH_CIGAM_64 = 0xCFFAEDFE
+FAT_MAGIC = 0xCAFEBABE
+BIG_ENDIAN = ">"
+LITTLE_ENDIAN = "<"
+LC_LOAD_DYLIB = 0xC
+maxint = getattr(sys, "maxsize", getattr(sys, "maxint", None))
+
+
+class FileView(object):
+    """
+    A proxy for file-like objects that exposes a given view of a file.
+    Modified from macholib.
+    """
+
+    def __init__(self, file_obj, start=0, size=maxint):
+        if isinstance(file_obj, FileView):
+            self._file_obj = file_obj._file_obj
+        else:
+            self._file_obj = file_obj
+        self._start = start
+        self._end = start + size
+        self._pos = 0
+
+    def __repr__(self):
+        return "<fileview [{:d}, {:d}] {!r}>".format(self._start, self._end, self._file_obj)
+
+    def tell(self):
+        return self._pos
+
+    def _checkwindow(self, seek_to, op):
+        if not (self._start <= seek_to <= self._end):
+            raise IOError(
+                "{} to offset {:d} is outside window [{:d}, {:d}]".format(op, seek_to, self._start, self._end)
+            )
 
-##file activate_this.py
-ACTIVATE_THIS = convert("""
-eJyNU01v2zAMvetXEB4K21jmDOstQA4dMGCHbeihlyEIDMWmG62yJEiKE//7kXKdpN2KzYBt8euR
-fKSyLPs8wiEo8wh4wqZTGou4V6Hm0wJa1cSiTkJdr8+GsoTRHuCotBayiWqQEYGtMCgfD1KjGYBe
-5a3p0cRKiAe2NtLADikftnDco0ko/SFEVgEZ8aRC5GLux7i3BpSJ6J1H+i7A2CjiHq9z7JRZuuQq
-siwTIvpxJYCeuWaBpwZdhB+yxy/eWz+ZvVSU8C4E9FFZkyxFsvCT/ZzL8gcz9aXVE14Yyp2M+2W0
-y7n5mp0qN+avKXvbsyyzUqjeWR8hjGE+2iCE1W1tQ82hsCZN9UzlJr+/e/iab8WfqsmPI6pWeUPd
-FrMsd4H/55poeO9n54COhUs+sZNEzNtg/wanpjpuqHJaxs76HtZryI/K3H7KJ/KDIhqcbJ7kI4ar
-XL+sMgXnX0D+Te2Iy5xdP8yueSlQB/x/ED2BTAtyE3K4SYUN6AMNfbO63f4lBW3bUJPbTL+mjSxS
-PyRfJkZRgj+VbFv+EzHFi5pKwUEepa4JslMnwkowSRCXI+m5XvEOvtuBrxHdhLalG0JofYBok6qj
-YdN2dEngUlbC4PG60M1WEN0piu7Nq7on0mgyyUw3iV1etLo6r/81biWdQ9MWHFaePWZYaq+nmp+t
-s3az+sj7eA0jfgPfeoN1
-""")
+    def seek(self, offset, whence=0):
+        seek_to = offset
+        if whence == os.SEEK_SET:
+            seek_to += self._start
+        elif whence == os.SEEK_CUR:
+            seek_to += self._start + self._pos
+        elif whence == os.SEEK_END:
+            seek_to += self._end
+        else:
+            raise IOError("Invalid whence argument to seek: {!r}".format(whence))
+        self._checkwindow(seek_to, "seek")
+        self._file_obj.seek(seek_to)
+        self._pos = seek_to - self._start
+
+    def write(self, content):
+        here = self._start + self._pos
+        self._checkwindow(here, "write")
+        self._checkwindow(here + len(content), "write")
+        self._file_obj.seek(here, os.SEEK_SET)
+        self._file_obj.write(content)
+        self._pos += len(content)
+
+    def read(self, size=maxint):
+        assert size >= 0
+        here = self._start + self._pos
+        self._checkwindow(here, "read")
+        size = min(size, self._end - here)
+        self._file_obj.seek(here, os.SEEK_SET)
+        read_bytes = self._file_obj.read(size)
+        self._pos += len(read_bytes)
+        return read_bytes
+
+
+def read_data(file, endian, num=1):
+    """
+    Read a given number of 32-bits unsigned integers from the given file
+    with the given endianness.
+    """
+    res = struct.unpack(endian + "L" * num, file.read(num * 4))
+    if len(res) == 1:
+        return res[0]
+    return res
+
+
+def mach_o_change(at_path, what, value):
+    """
+    Replace a given name (what) in any LC_LOAD_DYLIB command found in
+    the given binary with a new name (value), provided it's shorter.
+    """
 
-if __name__ == '__main__':
-    main()
+    def do_macho(file, bits, endian):
+        # Read Mach-O header (the magic number is assumed read by the caller)
+        cpu_type, cpu_sub_type, file_type, n_commands, size_of_commands, flags = read_data(file, endian, 6)
+        # 64-bits header has one more field.
+        if bits == 64:
+            read_data(file, endian)
+        # The header is followed by n commands
+        for _ in range(n_commands):
+            where = file.tell()
+            # Read command header
+            cmd, cmd_size = read_data(file, endian, 2)
+            if cmd == LC_LOAD_DYLIB:
+                # The first data field in LC_LOAD_DYLIB commands is the
+                # offset of the name, starting from the beginning of the
+                # command.
+                name_offset = read_data(file, endian)
+                file.seek(where + name_offset, os.SEEK_SET)
+                # Read the NUL terminated string
+                load = file.read(cmd_size - name_offset).decode()
+                load = load[: load.index("\0")]
+                # If the string is what is being replaced, overwrite it.
+                if load == what:
+                    file.seek(where + name_offset, os.SEEK_SET)
+                    file.write(value.encode() + b"\0")
+            # Seek to the next command
+            file.seek(where + cmd_size, os.SEEK_SET)
 
-## TODO:
-## Copy python.exe.manifest
-## Monkeypatch distutils.sysconfig
+    def do_file(file, offset=0, size=maxint):
+        file = FileView(file, offset, size)
+        # Read magic number
+        magic = read_data(file, BIG_ENDIAN)
+        if magic == FAT_MAGIC:
+            # Fat binaries contain nfat_arch Mach-O binaries
+            n_fat_arch = read_data(file, BIG_ENDIAN)
+            for _ in range(n_fat_arch):
+                # Read arch header
+                cpu_type, cpu_sub_type, offset, size, align = read_data(file, BIG_ENDIAN, 5)
+                do_file(file, offset, size)
+        elif magic == MH_MAGIC:
+            do_macho(file, 32, BIG_ENDIAN)
+        elif magic == MH_CIGAM:
+            do_macho(file, 32, LITTLE_ENDIAN)
+        elif magic == MH_MAGIC_64:
+            do_macho(file, 64, BIG_ENDIAN)
+        elif magic == MH_CIGAM_64:
+            do_macho(file, 64, LITTLE_ENDIAN)
+
+    assert len(what) >= len(value)
+
+    with open(at_path, "r+b") as f:
+        do_file(f)
+
+
+if __name__ == "__main__":
+    main()
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--- a/web/tralalere/__init__.py	Tue Jan 21 22:11:51 2020 +0100
+++ b/web/tralalere/__init__.py	Sat Jan 25 02:22:57 2020 +0100
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-VERSION = (0, 4, 2, "final", 0)
+VERSION = (0, 4, 3, "final", 0)
 
 
 def get_version():