遵循 Head First Python 第二版时出现 Pytest-pep8 问题

Question

我一直在关注 Head First Python 第二版，在第 4 章中演示了 pep8 合规性测试。尽管代码与书中相同，但我的输出是不同的。

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测试代码非常简单：

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def search4vowels(phrase: str) -> set:\n    """Return vowels found in supplied phrase."""\n    vowels = set(\'aeiou\')\n    return vowels.intersection(set(phrase))\n\n\ndef search4letters(phrase: str, letters: str=\'aeiou\') -> set:\n    """Return a set of \'letters\' found in \'phrase\'."""\n    return set(letters).intersection(set(phrase))\n

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我尝试按照书中所示进行测试，并得到以下输出：

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\xce\xbb py.test.exe --pep8 vsearch.py\nc:\\users\\gx\\appdata\\local\\programs\\python\\python37-32\\lib\\site-packages\\pep8.py:110: FutureWarning: Possible nested set at position 1\n  EXTRANEOUS_WHITESPACE_REGEX = re.compile(r\'[[({] | []}),;:]\')\n============================= test session starts =============================\nplatform win32 -- Python 3.7.4, pytest-5.1.1, py-1.8.0, pluggy-0.12.0\nrootdir: C:\\Users\\gx\\Desktop\\H.F. Python\\mymodules\nplugins: pep8-1.0.6\ncollected 1 item\n\nvsearch.py .                                                             [100%]\n\n============================== warnings summary ===============================\nc:\\users\\gx\\appdata\\local\\programs\\python\\python37-32\\lib\\site-packages\\_pytest\\mark\\structures.py:324\n  c:\\users\\gx\\appdata\\local\\programs\\python\\python37-32\\lib\\site-packages\\_pytest\\mark\\structures.py:324:\nPytestUnknownMarkWarning: Unknown pytest.mark.pep8 - is this a typo?\nYou can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html\n    PytestUnknownMarkWarning,\n\n-- Docs: https://docs.pytest.org/en/latest/warnings.html\n======================== 1 passed, 1 warnings in 0.04s ========================\n

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（我稍微修改了空格以使其更具可读性）

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在书中没有发生这样的事情。\n在执行此操作之前，我已经新安装了 pytest 和 pytest-pep8，如书中所示。

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这是什么原因造成的？

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Answer 1

这似乎是一个已知问题：#23。解决方法是将pep8标记注册到pytest.ini：

[pytest]
markers =
    pep8: workaround for https://bitbucket.org/pytest-dev/pytest-pep8/issues/23/

或以编程方式将其注册在conftest.py：

def pytest_configure(config):
    config.addinivalue_line(
        'markers', 'pep8: workaround for https://bitbucket.org/pytest-dev/pytest-pep8/issues/23/'
    )