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pathlib.Path.with_suffix(None) became allowed in Python 3.13b1 #119113
Description
Bug report
Bug description:
In Python 3.13b1 (compared to Python 3.12 and earlier), the behavior of pathlib.Path.with_suffix(None) changed from raising an incidental TypeError to removing the suffix. This casues a certain test in pytest to fail. I am going to fix pytest to not rely on this in any case, but I think pathlib should either:
- Restore the previous behavior if it was unintended, or
- Update the doc that
Noneis now accepted. Currently it says " If the suffix is an empty string, the original suffix is removed".
CPython versions tested on:
3.12, 3.13
Operating systems tested on:
Linux
Activity
nineteendo commentedon May 17, 2024
Bisected to 19a1fc1
cpython/Lib/pathlib/_abc.py
Line 208 in 100c7ab
I guess we could replace that with this:
But we usually don't go out of our way to raise type errors.
pythonGH-119113: Raise `TypeError` on `pathlib.PurePath.with_suffix(N…
GH-119113: Raise `TypeError` from `pathlib.PurePath.with_suffix(None)` (
pythonGH-119113: Raise `TypeError` from `pathlib.PurePath.with_suffix…
[3.13] GH-119113: Raise `TypeError` from `pathlib.PurePath.with_suffi…
barneygale commentedon May 19, 2024
Thanks for reporting! Should be fixed in 3.13 beta 2.
pythonGH-119113: Raise `TypeError` from `pathlib.PurePath.with_suffix…