即使使用文档中的示例，也无法模拟打开 [英] Unable to mock open, even when using the example from the documentation

问题描述

我直接从Python 模拟文档:

I've copied and pasted the following code directly from the Python mock docs:

from unittest.mock import patch, mock_open

with patch('__main__.open', mock_open(read_data='bibble')) as m:
    with open('foo') as h:
        result = h.read()

m.assert_called_once_with('foo')
assert result == 'bibble'

运行此命令时，出现以下错误:

When I run this I get the following error:

AttributeError: <module '__main__' from 'path/to/file'> does not have the attribute 'open'

鉴于这是文档中给出的示例，所以我不确定该向何处转向.我正在运行Python 3.4.5.

Given that this is the example given in the documentation, I'm not sure where else to turn. I'm running Python 3.4.5.

推荐答案

我知道了.

open 是内置的，因此我需要修补 builtins.open ，而不是 __ main __.open .

open is a builtin, so I needed to patch builtins.open, not __main__.open.

跳过了文档中的此信息.

Skipped over this info in the docs.

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