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gh-130164: Fix inspect.Signature.bind() handling of positional-only args without defaults by jacobtylerwalls · Pull Request #130192 · python/cpython · GitHub

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gh-130164: Fix inspect.Signature.bind() handling of positional-only args without defaults - #130192

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serhiy-storchaka merged 2 commits into
python:mainfrom
jacobtylerwalls:fix-130164
Feb 18, 2025
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gh-130164: Fix inspect.Signature.bind() handling of positional-only args without defaults#130192
serhiy-storchaka merged 2 commits into
python:mainfrom
jacobtylerwalls:fix-130164

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jacobtylerwalls commented Feb 16, 2025 •
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Before
inspect.Signature.bind() failed to raise TypeError for positional-only arguments passed by keyword (due to a regression handling the case where a default is defined).
After
This is fixed.

Regression in 9c15202.

Interestingly, we did have a test case for this, but it unexpectedly passed because after calling bind(), the test helper also calls the underlying function, making assertRaises(TypeError, ... succeed regardless of the behavior of bind().

Closes #130164

bedevere-app Bot mentioned this pull request Feb 16, 2025
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jacobtylerwalls commented Feb 16, 2025
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Comment thread Lib/test/test_inspect/test_inspect.py
(1, 2, 3, 42, 50, {'c_po': 4}))

with self.assertRaisesRegex(TypeError, "missing 2 required positional arguments"):
with self.assertRaisesRegex(TypeError, "missing a required positional-only argument: 'a_po'"):

jacobtylerwalls Feb 16, 2025 •
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Some of these cases could be moved to the existing method test_signature_bind_posonly_kwargs() if desired?

jacobtylerwalls changed the title gh-130164: Fix inspect.signature.bind() handling of positional-only args without defaults gh-130164: Fix inspect.Signature.bind() handling of positional-only args without defaults Feb 16, 2025
dfremont approved these changes Feb 16, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Thanks for the very quick fix, @jacobtylerwalls! The new logic looks correct to me and does fix the bug I reported (the exception message is slightly different than a direct call to the function, but I at least don't care about that).

skirpichev commented Feb 17, 2025

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CC @picnixz

jacobtylerwalls commented Feb 17, 2025

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Thanks for the review (and the original report!)

(the exception message is slightly different than a direct call to the function, but I at least don't care about that).

Right, this was something I was trying to keep to in the original PR (#103404), but during review discussion there I became convinced it was of only marginal benefit. (This time around it seemed too complicated to be worth it, on first look anyway.)

serhiy-storchaka approved these changes Feb 18, 2025
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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

LGTM. 👍

serhiy-storchaka added the needs backport to 3.13 bugs and security fixes label Feb 18, 2025
serhiy-storchaka merged commit dab456d into python:main Feb 18, 2025

miss-islington-app Bot commented Feb 18, 2025

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Thanks @jacobtylerwalls for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Feb 18, 2025
pythongh-130164: Fix inspect.Signature.bind() handling of positional-…
d6931c5 
…only args without defaults (pythonGH-130192)

Follow-up to 9c15202.
(cherry picked from commit dab456d)

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

bedevere-app Bot commented Feb 18, 2025

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GH-130271 is a backport of this pull request to the 3.13 branch.

bedevere-app Bot removed the needs backport to 3.13 bugs and security fixes label Feb 18, 2025
jacobtylerwalls deleted the fix-130164 branch February 18, 2025 16:27
serhiy-storchaka pushed a commit that referenced this pull request Apr 8, 2025
[3.13] gh-130164: Fix inspect.Signature.bind() handling of positional…
5c658c1 
…-only args without defaults (GH-130192) (GH-130271)

Follow-up to 9c15202.
(cherry picked from commit dab456d)

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>
serhiy-storchaka added the needs backport to 3.12 only security fixes label Apr 8, 2025

miss-islington-app Bot commented Apr 8, 2025

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Thanks @jacobtylerwalls for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.12.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Apr 8, 2025
pythongh-130164: Fix inspect.Signature.bind() handling of positional-…
ecdf998 
…only args without defaults (pythonGH-130192)

Follow-up to 9c15202.
(cherry picked from commit dab456d)

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

bedevere-app Bot commented Apr 8, 2025

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GH-132259 is a backport of this pull request to the 3.12 branch.

bedevere-app Bot removed the needs backport to 3.12 only security fixes label Apr 8, 2025
serhiy-storchaka pushed a commit that referenced this pull request Apr 8, 2025
[3.12] gh-130164: Fix inspect.Signature.bind() handling of positional…
40f81e1 
…-only args without defaults (GH-130192) (GH-132259)

Follow-up to 9c15202.
(cherry picked from commit dab456d)

Co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>
ryanking13 mentioned this pull request Aug 2, 2025
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Drranny added a commit to Drranny/pyodide that referenced this pull request Aug 2, 2025
Add comment about TypeError message change in Python 3.13.3 (python/c…
0b02fcb 
…python#130192)
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skirpichev skirpichev approved these changes
serhiy-storchaka serhiy-storchaka approved these changes
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dfremont dfremont approved these changes
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Signature.bind allows certain positional-only parameters as keywords

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