1 from django.conf import settings

     2 from django.core.exceptions import ImproperlyConfigured

     3 from django.utils.importlib import import_module

     4 

     5 geom_backend = getattr(settings, 'GEOMETRY_BACKEND', 'geos')

     6 

     7 try:

     8     module = import_module('.%s' % geom_backend, 'django.contrib.gis.geometry.backend')

     9 except ImportError, e:

    10     try:

    11         module = import_module(geom_backend)

    12     except ImportError, e_user:

    13         raise ImproperlyConfigured('Could not import user-defined GEOMETRY_BACKEND '

    14                                    '"%s".' % geom_backend)

    15 

    16 try:

    17     Geometry = module.Geometry

    18     GeometryException = module.GeometryException

    19 except AttributeError:

    20     raise ImproperlyConfigured('Cannot import Geometry from the "%s" '

    21                                'geometry backend.' % geom_backend)