gistfile1.py

# import sources from where check for auth backends
SOCIAL_AUTH_IMPORT_SOURCES = (
    'social_auth.backends',
    'social_auth.backends.contrib',
) + getattr(settings, 'SOCIAL_AUTH_IMPORT_BACKENDS', ())

def get_backends():
    backends = {}

    for mod_name in SOCIAL_AUTH_IMPORT_SOURCES:
        try:
            mod = import_module(mod_name)
        except ImportError:
            continue

        for directory, subdir, files in walk(mod.__path__[0]):
            for name in filter(lambda name: name.endswith('.py'), files):
                try:
                    name = basename(name).replace('.py', '')
                    sub = import_module(mod_name + '.' + name)
                    # register only enabled backends
                    backends.update(((key, val)
                                        for key, val in sub.BACKENDS.items()
                                            if val.enabled()))
                except (ImportError, AttributeError):
                    pass
    return backends

# load backends from defined modules
BACKENDS = get_backends()