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How to add a Python import path using a .pth file

If I put a *.pth file in site-packages it's giving an ImportError. I'm not getting how to import by creating a *.pth file.

(Refers to importing in python)

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If you put a .pth file in the site-packages directory containing a path, python searches this path for imports. So I have a sth.pth file there that simply contains:

K:SourcePythonlib

In that directory there are some normal Python modules:

logger.py
fstools.py
...

This allows to directly import these modules from other scripts:

import logger

log = logger.Log()
...

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