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pathlib .suffix, .suffixes, .stem unexpected behavior for pathname with trailing dot #82805

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inyeollee mannequin opened this issue Oct 28, 2019 · 1 comment
Open

pathlib .suffix, .suffixes, .stem unexpected behavior for pathname with trailing dot #82805

inyeollee mannequin opened this issue Oct 28, 2019 · 1 comment
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3.8 expert-pathlib stdlib type-bug

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@inyeollee
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Mannequin

@inyeollee inyeollee mannequin commented Oct 28, 2019

BPO 38624
Nosy @pitrou

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-10-28.22:54:26.232>
labels = ['3.8', 'type-bug', 'library']
title = 'pathlib .suffix, .suffixes, .stem unexpected behavior for pathname with trailing dot'
updated_at = <Date 2019-10-29.01:59:29.319>
user = 'https://bugs.python.org/inyeollee'

bugs.python.org fields:

activity = <Date 2019-10-29.01:59:29.319>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-10-28.22:54:26.232>
creator = 'inyeollee'
dependencies = []
files = []
hgrepos = []
issue_num = 38624
keywords = []
message_count = 1.0
messages = ['355600']
nosy_count = 2.0
nosy_names = ['pitrou', 'inyeollee']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38624'
versions = ['Python 3.8']
@inyeollee
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@inyeollee inyeollee mannequin commented Oct 28, 2019

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.

@inyeollee inyeollee mannequin added 3.8 stdlib type-bug labels Oct 28, 2019
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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