[New-bugs-announce] [issue25871] textwrap.dedent doesn't find common substring when spaces and tabs are mixed

[Chris Tozer]

New submission from Chris Tozer:

Two lines, one has three spaces, one has two spaces then a tab - dedent doesn't take the two spaces away...

Python 2.7.5 (default, Nov 20 2015, 02:00:19) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from textwrap import dedent
>>> dedent("   some\n  \tthing")
'   some\n  \tthing'
>>> dedent("   some\n   \tthing")
'some\n\tthing'

Looks very similar to issue 21827, but having upgraded to a newer build of 2.7 (Nov 2015, as above), I still see the same behaviour.  I assume the November build would have a fix made in October, but I don't know how the process actually works...

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components: Library (Lib)
messages: 256463
nosy: Chris Tozer
priority: normal
severity: normal
status: open
title: textwrap.dedent doesn't find common substring when spaces and tabs are mixed
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25871>
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