https://github.com/python/cpython/commit/f8c93d43edfeaea33c5dbff20f394212cb5c157f
commit: f8c93d43edfeaea33c5dbff20f394212cb5c157f
branch: main
author: Steve Dower <[email protected]>
committer: zooba <[email protected]>
date: 2026-08-21T14:36:36+01:00
summary:
gh-155254: Avoid warning about missing stdlib when using _pth files (GH-156015)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-08-18-14-19-51.gh-issue-155254.75TMlb.rst
M Doc/library/sys_path_init.rst
M Modules/getpath.py
diff --git a/Doc/library/sys_path_init.rst b/Doc/library/sys_path_init.rst
index e6c2cddbe84248..329e49253e91aa 100644
--- a/Doc/library/sys_path_init.rst
+++ b/Doc/library/sys_path_init.rst
@@ -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
----------
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-08-18-14-19-51.gh-issue-155254.75TMlb.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-08-18-14-19-51.gh-issue-155254.75TMlb.rst
new file mode 100644
index 00000000000000..4ebe0a417c3f3b
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-08-18-14-19-51.gh-issue-155254.75TMlb.rst
@@ -0,0 +1 @@
+Avoid warning about missing standard library when using
:ref:`sys-path-init-_pth-files`.
diff --git a/Modules/getpath.py b/Modules/getpath.py
index 6199567bd777aa..c322d5c4b4c251 100644
--- a/Modules/getpath.py
+++ b/Modules/getpath.py
@@ -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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