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GeezerVison is showing github.com — `shutil.which` cannot return `PathLike`, and fails with `cmd: PathLike` on Windows Python < 3.12 by Avasam · Pull Request #13580 · python/typeshed

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@Avasam

@Avasam Avasam commented Mar 4, 2025 •
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As found on Python's Discord: https://discord.com/channels/267624335836053506/891788761371906108/1346539455267213372

Linux:

>>> import shutil
>>> from pathlib import Path
>>> which(Path("bash"))
'/usr/bin/bash'

Python 3.10, Windows:

>>> import shutil
>>> from pathlib import Path
>>> shutil.which(Path("python"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\Avasam\AppData\Local\Programs\Python\Python310\lib\shutil.py", line 1492, in which
    if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
  File "C:\Users\Avasam\AppData\Local\Programs\Python\Python310\lib\shutil.py", line 1492, in <genexpr>
    if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
AttributeError: 'WindowsPath' object has no attribute 'lower'. Did you mean: 'owner'?

Python 3.12 & 3.13, Windows:

>>> import shutil
>>> from pathlib import Path
>>> shutil.which(Path("python"))
'E:\\Program Files\\uv\\cache\\archive-v0\\9TtCCyEjyO6hv113bBovk\\Scripts\\python.EXE'

Oh and all cases I found, folders return None

Relevant CPython PR (I think) that fixed Path on Windows: python/cpython#103179

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@Avasam
shutil.which cannot return PathLike
aad5772
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@Avasam
Remove unused variable
fa7646b
@github-actions

github-actions Bot commented Mar 4, 2025

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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

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srittau
srittau approved these changes Mar 5, 2025
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@srittau
srittau merged commit 58a4c08 into python:main Mar 5, 2025
mmingyu pushed a commit to mmingyu/typeshed that referenced this pull request May 16, 2025
@Avasam mingyu.park
shutil.which cannot return PathLike, and fails with `cmd: PathLik…
aa158a8
…e` on Windows Python < 3.12 (python#13580)
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@srittau srittau srittau approved these changes

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@Avasam @srittau
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