1 """

     2 Providing iterator functions that are not in all version of Python we support.

     3 Where possible, we try to use the system-native version and only fall back to

     4 these implementations if necessary.

     5 """

     6 

     7 import itertools

     8 

     9 # Fallback for Python 2.4, Python 2.5

    10 def product(*args, **kwds):

    11     """

    12     Taken from http://docs.python.org/library/itertools.html#itertools.product

    13     """

    14     # product('ABCD', 'xy') --> Ax Ay Bx By Cx Cy Dx Dy

    15     # product(range(2), repeat=3) --> 000 001 010 011 100 101 110 111

    16     pools = map(tuple, args) * kwds.get('repeat', 1)

    17     result = [[]]

    18     for pool in pools:

    19         result = [x+[y] for x in result for y in pool]

    20     for prod in result:

    21         yield tuple(prod)

    22 

    23 if hasattr(itertools, 'product'):

    24     product = itertools.product

    25 

    26 def is_iterable(x):

    27     "A implementation independent way of checking for iterables"

    28     try:

    29         iter(x)

    30     except TypeError:

    31         return False

    32     else:

    33         return True

    34 

    35 def all(iterable):

    36     for item in iterable:

    37         if not item:

    38             return False

    39     return True