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sysconfig data inconsistencies caused by the disabling thesite initialization on virtual environments #126789

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@FFY00

Description

@FFY00

Bug report

Bug description:

Currently, running the Python interpreter with-S (disabling thesite module initialization) causes several inconsistenciessysconfig.get_paths() depends on whethersysconfig was imported before or after thesite initialization

Currently,sysconfig calculates the paths at import time and caches them. This results in it resulting incorrect paths if thesite initialization happens aftersysconfig was imported.

$python-SPython3.14.0a1+experimentalfree-threadingbuild (heads/main:de0d5c6e2e1,Oct232024,15:37:46) [GCC14.2.120240910]onlinux>>>importsysconfig>>>sysconfig.get_paths(){'stdlib':'/usr/local/lib/python3.14t','platstdlib':'/usr/local/lib/python3.14t','purelib':'/usr/local/lib/python3.14t/site-packages','platlib':'/usr/local/lib/python3.14t/site-packages','include':'/usr/local/include/python3.14td','platinclude':'/usr/local/include/python3.14td','scripts':'/usr/local/bin','data':'/usr/local'}>>>importsite>>>site.main()>>>sysconfig.get_paths(){'stdlib':'/usr/local/lib/python3.14t','platstdlib':'/usr/local/lib/python3.14t','purelib':'/usr/local/lib/python3.14t/site-packages','platlib':'/usr/local/lib/python3.14t/site-packages','include':'/usr/local/include/python3.14td','platinclude':'/usr/local/include/python3.14td','scripts':'/usr/local/bin','data':'/usr/local'}

Expected output when thesite module has been initialized:

$pythonPython3.14.0a1+experimentalfree-threadingbuild (heads/main:de0d5c6e2e1,Oct232024,15:37:46) [GCC14.2.120240910]onlinuxType"help","copyright","credits"or"license"formoreinformation.>>>importsysconfig>>>sysconfig.get_paths(){'stdlib':'/usr/local/lib/python3.14t','platstdlib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t','purelib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t/site-packages','platlib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t/site-packages','include':'/usr/local/include/python3.14td','platinclude':'/usr/local/include/python3.14td','scripts':'/home/anubis/.virtualenvs/test-sysconfig-paths/bin','data':'/home/anubis/.virtualenvs/test-sysconfig-paths'}

And just to make sure this is not dependent on the interpreter being run with-S, and rather on thesysconfig import time.

$python-SPython3.14.0a1+experimentalfree-threadingbuild (heads/main:de0d5c6e2e1,Oct232024,15:37:46) [GCC14.2.120240910]onlinux>>>importsite>>>site.main()>>>importsysconfig>>>sysconfig.get_paths(){'stdlib':'/usr/local/lib/python3.14t','platstdlib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t','purelib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t/site-packages','platlib':'/home/anubis/.virtualenvs/test-sysconfig-paths/lib/python3.14t/site-packages','include':'/usr/local/include/python3.14td','platinclude':'/usr/local/include/python3.14td','scripts':'/home/anubis/.virtualenvs/test-sysconfig-paths/bin','data':'/home/anubis/.virtualenvs/test-sysconfig-paths'}

CPython versions tested on:

3.9, 3.10, 3.11, 3.12, 3.13, 3.14

Operating systems tested on:

Linux

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