python - Pytest 警告 : Module already imported so cannot be rewritten: pytest_remotedata

Question

我创建了一些单元测试并从同一个文件运行它们。对于同一文件中的测试:

if __name__ == "__main__":
    import pytest
    pytest.main(['--tb=short', __file__])

对于另一个文件中的测试:

if __name__ == '__main__':
    import pytest
    pytest.main(['./test_stuff.py', "--capture=sys"])

在任何一种情况下，当我第一次执行该文件时，它工作正常，但第二次和随后的时间它给出了一堆警告:

============================== warnings summary ===============================
C:\Anaconda3\lib\site-packages\_pytest\config\__init__.py:754
  C:\Anaconda3\lib\site-packages\_pytest\config\__init__.py:754: PytestWarning: Module already imported so cannot be rewritten: pytest_remotedata
    self._mark_plugins_for_rewrite(hook)
  C:\Anaconda3\lib\site-packages\_pytest\config\__init__.py:754: PytestWarning: Module already imported so cannot be rewritten: pytest_openfiles
    self._mark_plugins_for_rewrite(hook)
  C:\Anaconda3\lib\site-packages\_pytest\config\__init__.py:754: PytestWarning: Module already imported so cannot be rewritten: pytest_doctestplus
    self._mark_plugins_for_rewrite(hook)
  C:\Anaconda3\lib\site-packages\_pytest\config\__init__.py:754: PytestWarning: Module already imported so cannot be rewritten: pytest_arraydiff
    self._mark_plugins_for_rewrite(hook)

-- Docs: https://docs.pytest.org/en/latest/warnings.html
==================== 1 passed, 4 warnings in 0.06 seconds 

有什么方法可以让这些警告消失吗？

重新启动内核可以，但 IPython 的 %reset 和 %clear 也不足以修复它。

Answer 1

使用subprocess代替pytest.main:

if __name__ == "__main__":
    import subprocess
    subprocess.call(['pytest', '--tb=short', str(__file__)])

如果以上没有打印任何内容，请尝试解决方法(如评论中所建议):

if __name__ == "__main__":
    from subprocess import Popen, PIPE
    with Popen(['pytest',
                '--tb=short',  # shorter traceback format
                str(__file__)], stdout=PIPE, bufsize=1,
                universal_newlines=True) as p:
        for line in p.stdout:
            print(line, end='')