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GeezerVison is showing github.com — gh-75221: Search __main__ only in the executed directory or zipfile by serhiy-storchaka · Pull Request #155256 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Aug 5, 2026

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runpy.run_path() and the execution of a directory or a zipfile searched the __main__ module in the whole sys.path, so an existing __main__ module located elsewhere could be executed instead of failing.

As a result, running Lib/test/test_runpy.py directly ran the whole test suite.

The __main__ module is now searched only in sys.path[0] -- the executed directory or zipfile.

  • Issue: test_runpy causes running all Python tests when run directly #75221

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@serhiy-storchaka @claude
pythongh-75221: Search __main__ only in the executed directory or zip…
8ab0abb 
…file

runpy.run_path() and the execution of a directory or a zipfile searched the
__main__ module in the whole sys.path, so an existing __main__ module
located elsewhere could be executed instead of failing.  As a result,
running Lib/test/test_runpy.py directly ran the whole test suite.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
@serhiy-storchaka
serhiy-storchaka requested review from FFY00 and ericsnowcurrently as code owners August 5, 2026 19:29
@bedevere-app bedevere-app Bot added the awaiting core review label Aug 5, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Aug 5, 2026
test_runpy causes running all Python tests when run directly #75221
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@serhiy-storchaka
serhiy-storchaka requested a review from ncoghlan August 5, 2026 19:31
@read-the-docs-community

read-the-docs-community Bot commented Aug 5, 2026

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Documentation build overview

📚 cpython-previews | 🛠️ Build #33932419 | 📁 Comparing 8ab0abb against main (4bbc20b)

  🔍 Preview build  

2 files changed
± library/runpy.html
± whatsnew/changelog.html
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@github-actions

github-actions Bot commented Nov 6, 2026

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This PR is stale because it has been open for 90 days with no activity.
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@github-actions github-actions Bot added the stale Stale PR or inactive for long period of time. label Nov 6, 2026
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@ericsnowcurrently ericsnowcurrently Awaiting requested review from ericsnowcurrently ericsnowcurrently is a code owner
@FFY00 FFY00 Awaiting requested review from FFY00 FFY00 is a code owner
@ncoghlan ncoghlan Awaiting requested review from ncoghlan

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@serhiy-storchaka
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