module zipfile issue on closing

[bastianebeling]

BPO	41640
Nosy	@jaraco, @tirkarthi
Superseder	bpo-40564: Using zipfile.Path with several files prematurely closes zip

^{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 = <Date 2020-08-29.12:59:33.470>
created_at = <Date 2020-08-26.07:31:32.143>
labels = ['3.8', 'type-bug', 'library']
title = 'module zipfile issue on closing'
updated_at = <Date 2020-08-29.12:59:33.468>
user = 'https://bugs.python.org/bastianebeling'

bugs.python.org fields:

activity = <Date 2020-08-29.12:59:33.468>
actor = 'xtreak'
assignee = 'none'
closed = True
closed_date = <Date 2020-08-29.12:59:33.470>
closer = 'xtreak'
components = ['Library (Lib)']
creation = <Date 2020-08-26.07:31:32.143>
creator = 'bastian.ebeling'
dependencies = []
files = []
hgrepos = []
issue_num = 41640
keywords = []
message_count = 4.0
messages = ['375917', '375918', '375922', '376061']
nosy_count = 3.0
nosy_names = ['jaraco', 'xtreak', 'bastian.ebeling']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '40564'
type = 'behavior'
url = 'https://bugs.python.org/issue41640'
versions = ['Python 3.8']

[bastianebeling]

When trying to open an archive and read internal binary streams, for me it occurs, that the file-stream gets closed.
As a code-Snippet:

import zipfile
srcfile=zipfile.ZipFile('file.zip')
a=zipfile.Path(srcfile,"data1.bin").read_bytes()
b=zipfile.Path(srcfile,"data2.bin").read_bytes()

the second call results in the ValueError: seek of closed file

A quick and dirty solution (as an idea) is to change close() for the _SharedFile to run self.close() instead of self._close(findeobj) in the end (somehow around line 772).

Hopefully that helps

[tirkarthi]

This seems to be a duplicate of bpo-40564 . Can you please add the python version you are using?

[bastianebeling]

My used python Version is
Python 3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:57:54) [MSC v.1924 64 bit (AMD64)] on win32
Indead - this issue seems to be the same as 40564, but maybe my suggested solution is helpful?

[tirkarthi]

Thanks, I am closing this in favor of bpo-40564. Jason has provided some possible approaches in bpo-40564 (msg375964) and would be helpful to follow the discussion there since it has more details.