test_imp.py 文件源码

def test_source_from_cache_no_cache_tag(self):
        # If sys.implementation.cache_tag is None, raise NotImplementedError.
        path = os.path.join('blah', '__pycache__', 'whatever.pyc')
        with support.swap_attr(sys.implementation, 'cache_tag', None):
            with self.assertRaises(NotImplementedError):
                imp.source_from_cache(path)