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