test_standard_library.py 文件源码

def test_suspend_hooks(self):
        """
        Code like the try/except block here appears in Pyflakes v0.6.1. This
        method tests whether suspend_hooks() works as advertised.
        """
        example_PY2_check = False
        with standard_library.suspend_hooks():
            # 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)
        # The import should succeed again now:
        import builtins