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URL: http://github.com/python/cpython/pull/145788

ssets/global-68dd150ce6c8e711.css" /> gh-145492: fix regression test for defaultdict factory repr by KowalskiThomas · Pull Request #145788 · python/cpython · GitHub
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gh-145492: fix regression test for defaultdict factory repr#145788

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encukou merged 1 commit intopython:mainfrom
KowalskiThomas:kowalski/test-fix-regression-test-for-defaultdict-factory-repr
Mar 11, 2026
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gh-145492: fix regression test for defaultdict factory repr#145788
encukou merged 1 commit intopython:mainfrom
KowalskiThomas:kowalski/test-fix-regression-test-for-defaultdict-factory-repr

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@KowalskiThomas KowalskiThomas commented Mar 10, 2026 •
edited by encukou
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What is this PR?

This PR fixes the regression test introduced in #145761 and that did not properly reproduce the issue.

Running the test without the repr changes now properly crashes.

% ./python.exe -m unittest test.test_defaultdict
..........E..
======================================================================
ERROR: test_repr_recursive_factory (test.test_defaultdict.TestDefaultDict.test_repr_recursive_factory)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/thomas.kowalski/Documents/cpython/Lib/test/test_defaultdict.py", line 219, in test_repr_recursive_factory
    r = repr(dd)
  File "/Users/thomas.kowalski/Documents/cpython/Lib/test/test_defaultdict.py", line 215, in __repr__
    return f"ProblematicFactory for {dd}"
                                    ^^^^
  File "/Users/thomas.kowalski/Documents/cpython/Lib/test/test_defaultdict.py", line 215, in __repr__
    return f"ProblematicFactory for {dd}"
                                    ^^^^
  File "/Users/thomas.kowalski/Documents/cpython/Lib/test/test_defaultdict.py", line 215, in __repr__
    return f"ProblematicFactory for {dd}"
                                    ^^^^
  [Previous line repeated 981 more times]
RecursionError: maximum recursion depth exceeded

----------------------------------------------------------------------
Ran 13 tests in 1.742s

gh-145492

@bedevere-app bedevere-app bot added tests Tests in the Lib/test dir awaiting review labels Mar 10, 2026
@bedevere-app bedevere-app bot mentioned this pull request Mar 10, 2026
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@KowalskiThomas KowalskiThomas mentioned this pull request Mar 10, 2026
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@StanFromIreland StanFromIreland mentioned this pull request Mar 10, 2026
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@YvesDup
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YvesDup commented Mar 11, 2026

This fix looks good to me ;)

@encukou encukou merged commit aa4240e into python:main Mar 11, 2026
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encukou commented Mar 11, 2026

Thank you!

encukou pushed a commit to miss-islington/cpython that referenced this pull request Mar 11, 2026
@KowalskiThomas @encukou
pythongh-145492: fix regression test for defaultdict factory repr (py…
1f64798 
…thonGH-145788)
encukou pushed a commit to miss-islington/cpython that referenced this pull request Mar 11, 2026
@KowalskiThomas @encukou
pythongh-145492: fix regression test for defaultdict factory repr (py…
f5c4f09 
…thonGH-145788)
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KowalskiThomas commented Mar 11, 2026

I guess we should backport the non-regression test as well?

encukou pushed a commit that referenced this pull request Mar 12, 2026
@miss-islington @KowalskiThomas @mvanhorn
[3.14] gh-145492: Fix defaultdict __repr__ infinite recursion (GH-145659
59be951 
) (GH-145747)

(cherry picked from commit 2d35f9b)

Includes test fix-up from GH-145788
(cherry picked from commit aa4240e)

Co-authored-by: Thomas Kowalski <thom.kowa@gmail.com>
Co-authored-by: Matt Van Horn <mvanhorn@users.noreply.github.com>
encukou pushed a commit that referenced this pull request Mar 12, 2026
@miss-islington @KowalskiThomas @mvanhorn
[3.13] gh-145492: Fix defaultdict __repr__ infinite recursion (GH-145659
cef423c 
) (GH-145746)

(cherry picked from commit 2d35f9b)

Includes test fix-up from GH-145788
(cherry picked from commit aa4240e)

Co-authored-by: Thomas Kowalski <thom.kowa@gmail.com>
Co-authored-by: Matt Van Horn <mvanhorn@users.noreply.github.com>
@encukou
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encukou commented Mar 12, 2026

Yes, I included it in the backports :)

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KowalskiThomas commented Mar 12, 2026

Great, thank you! 🙇

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@KowalskiThomas @YvesDup @encukou @StanFromIreland
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