test_standard_library.py 文件源码

def test_remove_hooks2(self):
        """
        As above, but with the new names
        """
        example_PY2_check = False

        standard_library.install_hooks()
        old_meta_path = copy.copy(sys.meta_path)

        standard_library.remove_hooks()
        standard_library.scrub_future_sys_modules()
        if utils.PY2:
            self.assertTrue(len(old_meta_path) == len(sys.meta_path) + 1)
        else:
            self.assertTrue(len(old_meta_path) == len(sys.meta_path))

        # An example of fragile import code that we don't want to break:
        try:
            import builtins
        except ImportError:
            example_PY2_check = True
        if utils.PY2:
            self.assertTrue(example_PY2_check)
        else:
            self.assertFalse(example_PY2_check)
        standard_library.install_hooks()
        # The import should succeed again now:
        import builtins
        self.assertTrue(len(old_meta_path) == len(sys.meta_path))