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E:\software\anaconda3\envs\py3.10\python.exe F:\python_project\test\Father\child\file3.py

Traceback (most recent call last):

  File "F:\python_project\test\Father\child\file3.py", line 1, in <module>

    from ..file1 import greet  # 这将失败，没有 __init__.py

ImportError: attempted relative import with no known parent package

Process finished with exit code 1

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test/

├── Father/

│   ├── file1.py

│   └── child/

│       └── file3.py

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def greet():

    print("Hello from file1")

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from ..file1 import greet  # 这将失败，没有 __init__.py

def main():

    greet()

if __name__ == "__main__":

    main()

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import sys

import os

# 将父目录添加到 sys.path

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from Father.file1 import greet

def main():

    greet()

if __name__ == "__main__":

    main()

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from ..file1 import greet

def main():

    greet()

if __name__ == "__main__":

    main()

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from Father.file1 import greet

def main():

    greet()

if __name__ == "__main__":

    main()

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from Father.file1 import greet

def main():

    greet()

if __name__ == "__main__":

    main()