New submission from Inyeol Lee <inyeol....@gmail.com>:
Python3.8 pathlib treats dot between path stem and suffix as part of suffix in
general:
>>> a = pathlib.Path('foo.txt')
>>> a.stem, a.suffix
('foo', '.txt')
>>> a.with_suffix('')
PosixPath('foo')
However, if pathname ends with dot, it treats the trailing dot as part of stem,
not part of suffix:
>>> b = pathlib.Path('bar.')
>>> b.stem, b.suffix
('bar.', '')
This looks like a bug. It should return ('bar', '.').
There are couple of unexpected behavior related to this:
>>> pathlib.Path('foo.txt').with_suffix('.')
...
ValueError: Invalid suffix '.' <== Why not PosixPath('foo.') ?
>>> c = pathlib.Path('foo..')
>>> c.stem, c.suffix, c.suffixes
('foo..', '', [])
I think above should return ('foo.', '.', ['.', '.'])
Tested with macOS 10.15 and Python3.8. Python3.7 behaves the same.
----------
components: Library (Lib)
messages: 355600
nosy: inyeollee
priority: normal
severity: normal
status: open
title: pathlib .suffix, .suffixes, .stem unexpected behavior for pathname with
trailing dot
type: behavior
versions: Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38624>
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