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gh-85567: Register a cleanup function to close files for FileType objects in argparse by achhina · Pull Request #32257 · python/cpython · GitHub

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gh-85567: Register a cleanup function to close files for FileType objects in argparse - #32257

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facundobatista merged 2 commits into
python:mainfrom
achhina:fix-issue-41395
Apr 18, 2022
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gh-85567: Register a cleanup function to close files for FileType objects in argparse#32257
facundobatista merged 2 commits into
python:mainfrom
achhina:fix-issue-41395

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achhina commented Apr 2, 2022 •
edited by bedevere-bot
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BPO-41395

  • Signed CLA
  • Ran tests and make patchcheck
  • Added News Entry

Hello! First-time contribution, I've read through what I believe to be the relevant sections in the Python Developer's Guide, however, feel free to let me know if there is something I missed.

This is a follow-up to PR-21702, where it was suggested to address the ResourceWarning issue directly in argparse itself. However, as that was discussed back in 2020, I've attempted to take a stab at it myself! After reading a suggestion from @facundobatista, I have added a file.close cleanup function with atexit for files opened with FileType objects, to ensure they are always closed.

Previously:

❯ ./python.exe -Wall -m pickle p1              
{'a': 1}
sys:1: ResourceWarning: unclosed file <_io.BufferedReader name='p1'>

❯ ./python.exe -Wall -m pickle p1 p2
/user: ResourceWarning: unclosed file <_io.BufferedReader name='p1'>
  value = [self._get_value(action, v) for v in arg_strings]
ResourceWarning: Enable tracemalloc to get the object allocation traceback
usage: pickle.py [-h] [-t] [-v] [pickle_file ...]
pickle.py: error: argument pickle_file: can't open 'p2': [Errno 2] No such file or directory: 'p2'

With Patch:

❯ ./python.exe -Wall -m pickle p1   
{'a': 1}

❯ ./python.exe -Wall -m pickle p1 p2
usage: pickle.py [-h] [-t] [-v] [pickle_file ...]
pickle.py: error: argument pickle_file: can't open 'p2': [Errno 2] No such file or directory: 'p2'

https://bugs.python.org/issue41395

the-knights-who-say-ni commented Apr 2, 2022

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Hello, and thanks for your contribution!

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achhina commented Apr 2, 2022 •
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Our records indicate the following people have not signed the CLA:

@achhina

If you have recently signed the CLA, please wait at least one business day
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I had signed the CLA last night, so just waiting for it to be processed.

achhina commented Apr 12, 2022

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Hi @facundobatista @serhiy-storchaka,

As both of you had reviewed PR-21702 and this follows up on that, would you be available to review this?

facundobatista requested changes Apr 14, 2022
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Hello! Thanks for the work! I annotated a couple of small suggestions.

Comment thread Lib/argparse.py Outdated
Comment thread Lib/argparse.py Outdated

bedevere-bot commented Apr 14, 2022

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A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

ghost commented Apr 14, 2022 •
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All commit authors signed the Contributor License Agreement.

achhina commented Apr 14, 2022

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Thanks for taking a look @facundobatista!

I have made the requested changes; please review again

bedevere-bot commented Apr 14, 2022

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Thanks for making the requested changes!

@facundobatista: please review the changes made to this pull request.

achhina changed the title bpo-41395: Register a cleanup function to close files for FileType objects in argparse gh-85567: Register a cleanup function to close files for FileType objects in argparse Apr 14, 2022
facundobatista approved these changes Apr 15, 2022
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It looks great! Thanks!

facundobatista merged commit 328dbc0 into python:main Apr 18, 2022
achhina deleted the fix-issue-41395 branch April 18, 2022 03:23
tirkarthi mentioned this pull request Apr 20, 2022
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vstinner mentioned this pull request Apr 21, 2022
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vstinner added a commit that referenced this pull request Apr 21, 2022
Revert "gh-85567: Register a cleanup function to close files for File…
f1b8d40 
…Type objects in argparse (#32257)"

This reverts commit 328dbc0.
vstinner added a commit that referenced this pull request Apr 21, 2022
Revert "gh-85567: Register a cleanup function to close files for File…
c77953b 
…Type objects in argparse (#32257)" (#91771)

This reverts commit 328dbc0.
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