[New-bugs-announce] [issue15880] os.path.split() and long UNC names

Kalle Rutanen report at bugs.python.org
Fri Sep 7 18:40:15 CEST 2012

New submission from Kalle Rutanen:

On Windows, long-UNC paths are needed to inspect and modify paths with more than 260 characters. The os.path.split() function behaves incorrectly in the presence of a long-UNC prefix //?/ or \\?\. Consider iterating d = os.path.split(d)[0] with d = '//?/e:/python-test/dir'. Then the values of d are as follows:


The two last splits are the incorrect ones, where the splitting should end at '//?/e:'.

One consequence of this is that os.makedirs(d) crashes, because it attempts to run os.mkdir('//') at the bottom of its recursion. The same thing happens when replacing all / with \\ in the above.

components: Library (Lib)
messages: 169990
nosy: kaba2
priority: normal
severity: normal
status: open
title: os.path.split() and long UNC names
type: crash
versions: Python 2.7

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