solution for python can not import local module

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这次遇到的问题是sys.path的输出不包含''，导致无法import当前文件和文件夹

When no ._pth file is found, this is how sys.path is populated on Windows:

• An empty entry is added at the start, which corresponds to the current directory.
• If the environment variable C:\ etc.).
• Additional “application paths” can be added in the registry as subkeys of\SOFTWARE\Python\PythonCore{version}\PythonPath under both the HKEY_CURRENT_USER and HKEY_LOCAL_MACHINE hives. Subkeys which have semicolon-delimited path strings as their default value will cause each path to be added to sys.path. (Note that all known installers only use HKLM, so HKCU is typically empty.)
• If the environment variable plat-win, etc) are based on that folder. Otherwise, the core Python path is constructed from the PythonPath stored in the registry.
• If the Python Home cannot be located, no .\Lib;.\plat-win, etc).

解决方案删除._pth文件，解决这个bug的经验教训就是一定要一步一步跟踪到问题原因，论英文文档的重要性