How do I find the location of Python module sources?

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For a pure python module you can find the source by looking at themodule.__file__.
The datetime module, however, is written in C, and therefore datetime.__file__ points to a .so file (there is no datetime.__file__ on Windows), and therefore, you can’t see the source.

If you download a python source tarball and extract it, the modules’ code can be found in the Modules subdirectory.

For example, if you want to find the datetime code for python 2.6, you can look at

Python-2.6/Modules/datetimemodule.c

You can also find the latest version of this file on github on the web at
https://github.com/python/cpython/blob/main/Modules/_datetimemodule.c

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