On the page:

https://docs.python.org/3.10/library/sys.html#sys.prefix

the text says

The main collection of Python library modules is installed in the directory prefix/lib/pythonX.Y while the platform independent header files (all except pyconfig.h) are stored in prefix/include/pythonX.Y, where X.Y is the version number of Python, for example 3.2.

However, this seems to only be true on *nix systems. On Windows, the lib and header files are just in prefix/lib and prefix/include. Maybe the text should be changed to say:

On linux, the main collection of Python library modules is installed in the directory prefix/lib/pythonX.Y while the platform independent header files (all except pyconfig.h) are stored in prefix/include/pythonX.Y, where X.Y is the version number of Python, for example 3.2. On Winodws, there are in prefix/lib and prefix/includes.