如何在同一目錄或子目錄中導入類?

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我有一個存放所有 .py 文件的目錄。

bin/ main.py user.py # 類用戶所在的位置 dir.py # 位置class Dir 位於 

我想在 main.py 中使用 user.pydir.py 中的類strong>.
如何將這些 Python 類導入 main.py
此外,如果 user.py,我如何導入類 User 在子目錄下?

bin/dir.py main.py usr/user.py 

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