config.py 文件源码

def patch_pkgutil_get_loader(wrapper_class=LimitedLoaderMockWrapper):
    """Patch pkgutil.get_loader to give loader without get_filename or archive.

    This provides for tests where a system has custom loaders, e.g. Google App
    Engine's HardenedModulesHook, which have neither the `get_filename` method
    nor the `archive` attribute.
    """
    old_get_loader = pkgutil.get_loader
    def get_loader(*args, **kwargs):
        return wrapper_class(old_get_loader(*args, **kwargs))
    try:
        pkgutil.get_loader = get_loader
        yield
    finally:
        pkgutil.get_loader = old_get_loader