tarfile.open: improper handling of path-like object

[DarkaMaul]

BPO	37144
Nosy	@terryjreedy, @gustaebel, @serhiy-storchaka, @tirkarthi, @DarkaMaul, @zygocephalus
PRs	bpo-37144: Convert path-like object to regular path #13817
Files	poc.py: Proof Of Concept

^{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 2019-06-03.14:54:20.472>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = 'tarfile.open: improper handling of path-like object'
updated_at = <Date 2019-06-07.19:59:04.122>
user = 'https://github.com/DarkaMaul'

bugs.python.org fields:

activity = <Date 2019-06-07.19:59:04.122>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-06-03.14:54:20.472>
creator = 'dm'
dependencies = []
files = ['48386']
hgrepos = []
issue_num = 37144
keywords = ['patch']
message_count = 3.0
messages = ['344423', '344616', '345005']
nosy_count = 6.0
nosy_names = ['terry.reedy', 'lars.gustaebel', 'serhiy.storchaka', 'xtreak', 'dm', 'zygocephalus']
pr_nums = ['13817']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37144'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

Linked PRs

• gh-81325: tarfile should accept a path-like object when writing a compressed gzip #137188
• [3.14] gh-81325: Support path-like objects with streaming TarFile (GH-137188) #137365
• [3.13] gh-81325: Support path-like objects with streaming TarFile (GH-137188) #137366

[DarkaMaul]

According to the documentation, tarfile.open accepts a path-like object since Python 3.6

However, it is not the case when writing a compressed gzip (w|gz).
See the attached file for minimal POC

Note 1: tested on 3.6 and 3.7
Note 2: https://docs.python.org/3.6/library/tarfile.html#tarfile.open

[tirkarthi]

This was documented in c45cd16 but it seems a test for opening gzip file with 'w|gz' mode as in the original report was missing.

[terryjreedy]

3.6 only gets security patches. Thanks for testing with 3.7 also.