test_resources.py 文件源码

def patched_path(self, tmpdir):
        """
        Patch sys.path to include the 'site-pkgs' dir. Also
        restore pkg_resources._namespace_packages to its
        former state.
        """
        saved_ns_pkgs = pkg_resources._namespace_packages.copy()
        saved_sys_path = sys.path[:]
        site_pkgs = tmpdir.mkdir('site-pkgs')
        sys.path.append(str(site_pkgs))
        try:
            yield
        finally:
            pkg_resources._namespace_packages = saved_ns_pkgs
            sys.path = saved_sys_path