ZipFile.extractall is not multiprocess safe with regard to directory creation.

[nathansilberman]

BPO	40103
Nosy	@Yhg1s, @serhiy-storchaka, @nathansilberman
PRs	bpo-40103: Ensuring that ZipFiles with overlapping directories can be extracted simultaneously from multiple processes. #19216

^{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 2020-03-29.16:33:47.483>
labels = ['3.7', '3.8', 'type-bug', 'library', '3.9']
title = 'ZipFile.extractall is not multiprocess safe with regard to directory creation.'
updated_at = <Date 2020-05-22.20:15:02.673>
user = 'https://github.com/nathansilberman'

bugs.python.org fields:

activity = <Date 2020-05-22.20:15:02.673>
actor = 'cheryl.sabella'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-03-29.16:33:47.483>
creator = 'nathansilberman'
dependencies = []
files = []
hgrepos = []
issue_num = 40103
keywords = ['patch']
message_count = 1.0
messages = ['365268']
nosy_count = 3.0
nosy_names = ['twouters', 'serhiy.storchaka', 'nathansilberman']
pr_nums = ['19216']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40103'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']

[nathansilberman]

When extracting multiple zip files, each from a separate process, if the files being extracted are in nested directories and files across zips contain the same parent directories, the extraction process fails as one zip attempts to create a directory that was already created by the extraction call in another process.

[gpshead]

This is basically asking for zipfile to have a mode where the filesystem it is extracting to can change out from underneath it mid-extraction and it should just ignore errors and continue on.

An ignore_errors=True style of feature is probably feasible to implement, but I don't think it'd ever be a good idea for someone to use it...