Difference in behaviour of PureWindowsPath in 3.12.0b2 with multiple slashes

Bug report

I was trying to add Python3.12 beta 2 to the test suit of xonsh . The tests on Windows were failing because of the difference in behaviour of PureWindowsPath.

This can be reproduced like this

in Python 3.11

>>> from pathlib import PurePosixPath, PureWindowsPath
>>> PurePosixPath("///tmp")
PurePosixPath('/tmp')
>>> PureWindowsPath(r"\\\tmp")
PureWindowsPath('/tmp')

but the same in Python 3.12.0b2 would be giving different result

In [1]: from pathlib import PurePosixPath, PureWindowsPath
In [2]: PurePosixPath("///tmp")
Out[2]: PurePosixPath('/tmp')
In [3]: PureWindowsPath(r"\\\tmp")
Out[3]: PureWindowsPath('///tmp')

I've checked the changelog and this change of behaviour wasn't mentioned in it.

Your environment

CPython versions tested on: 3.12.0b2
Operating system and architecture: Windows 64bit

@barneygale

git bisect points to 8af8f52 (gh-102003). @barneygale

How I performed the search, for reproducibility

script

git bisect start
git bisect good v3.11.0
git bisect bad main
git bisect run .\gh-105881.cmd

gh-105881.cmd:

@echo off
setlocal EnableDelayedExpansion

git clean -fx -e gh-105881*
call pcbuild\clean
call pcbuild\build

for /F "usebackq delims=" %%a IN (`call python.bat gh-105881.py`) do (
    if "%%a" == "PureWindowsPath('///tmp')" exit /b 1
)

gh-105881.py:

from pathlib import PureWindowsPath
print(repr(PureWindowsPath(r"\\\tmp")))

In Python 3.12, all Windows paths beginning // or \\ are considered to be UNC paths, and so we don't remove leading slashes. In previous versions of Python the rules were more complex. More info here: #96290 (comment)

It's mentioned in the changelog (ctrl-f for "Fix handling of partial and invalid UNC drives in ntpath.splitdrive()") but the reST formatting of the entry is messed up. Will fix!

Thanks for clarifying !

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Difference in behaviour of PureWindowsPath in 3.12.0b2 with multiple slashes #105881

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Difference in behaviour of PureWindowsPath in 3.12.0b2 with multiple slashes #105881

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arhadthedev commented on Jun 17, 2023

barneygale commented on Jun 17, 2023

jnoortheen commented on Jun 17, 2023

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