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gh-155254: Avoid warning about missing stdlib when using _pth files #156015

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gh-155254: Avoid warning about missing stdlib when using _pth files #156015

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gh-155254: Avoid warning about missing stdlib when using _pth files
zooba Aug 18, 2026
191e278
Clarify comment and logic
zooba Aug 18, 2026
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2 changes: 2 additions & 0 deletions Doc/library/sys_path_init.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,8 @@ Please refer to :mod:`site`'s
mechanism, such as :mod:`venv`, that many virtual environment implementations
follow.

.. _sys-path-init-_pth-files:

_pth files
----------

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-08-18-14-19-51.gh-issue-155254.75TMlb.rst
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@@ -0,0 +1 @@
Avoid warning about missing standard library when using :ref:`sys-path-init-_pth-files`.
8 changes: 4 additions & 4 deletions Modules/getpath.py
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Expand Up @@ -766,10 +766,10 @@ def search_up(prefix, *landmarks, test=isfile):
# SANITY CHECKS
# ******************************************************************************

# Warn if the standard library is missing, unless pythonpath_was_set was set, as
# that skips parts of the stdlib directories calculation — assume the provided
# pythonpath is correct. This is how subinterpreters initialize the path for eg.
if not py_setpath and not pythonpath_was_set:
# Warn if we did a search for the standard library and couldn't find it. Never
# show a warning if paths were provided explicitly, since we trust the caller
# knows what they're doing even if the layout doesn't look "normal".
if not (py_setpath or pythonpath_was_set or pth):
home_hint = f"The Python 'home' directory was set to {home!r}, is this correct?"
if (not stdlib_zip or not isfile(stdlib_zip)) and (not stdlib_dir or not isdir(stdlib_dir)):
hint = home_hint if home else f'sys.prefix is set to {prefix}, is this correct?'
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