模拟0.7.0中更改了此方法，该模拟最终支持模拟python协议方法（魔术方法），特别是使用MagicMock：
http://www.voidspace.org.uk/python/mock/magicmock.html
作为上下文管理器进行模拟打开的示例（来自模拟文档中的示例页面）：
>>> open_name = '%s.open' % __name__
>>> with patch(open_name, create=True) as mock_open:
... mock_open.return_value = MagicMock(spec=file)
...
... with open('/some/path', 'w') as f:
... f.write('something')
...
<mock.Mock object at 0x...>
>>> file_handle = mock_open.return_value.__enter__.return_value
>>> file_handle.write.assert_called_with('something')
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