Jeroen Demeyer added the comment:
There is also
commit fa2f4b6d8e297eda09d8ee52dc4a3600b7d458e7
Author: Greg Ward
Date: Sat Jun 24 17:22:39 2000 +0000
Changed the default installation directory for data files (used by
the "install_data" command to the installation base, which is usually just
sys.prefix. (Any setup scripts out there that specify data files will have
to set the installation directory, relative to the base, explicitly.)
with commit message stating that data_files are installed in sys.prefix.
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Python tracker
https://bugs.python.org/issue25592
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