[New-bugs-announce] [issue35314] fnmatch failed with leading caret (^)

[Cyker Way]

New submission from Cyker Way <cykerway at gmail.com>:

In short, `fnmatch.fnmatch` doesn't match shell result. To test this, create a dir with 2 files: `a.py` and `b.py`. Then `ls [!b].py` and `ls [^b].py` will both show `a.py`. However, `fnmatch.fnmatch('a.py', '[!b].py')` returns `True` but `fnmatch.fnmatch('a.py', '[^b].py')` returns `False`.

Problem seems to come from an escaped caret: https://github.com/python/cpython/blob/master/Lib/fnmatch.py#L124

I don't see why caret and exclamation mark are different from `man bash`:

>   ...If the first character following the [ is a !  or a ^ then any character not enclosed is matched...

Could someone please confirm it's a bug or intended behavior?

----------
components: Library (Lib)
messages: 330417
nosy: cykerway
priority: normal
severity: normal
status: open
title: fnmatch failed with leading caret (^)
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35314>
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