bpo-46581: Propagate private vars via _GenericAlias.copy_with #31061

posita · 2022-02-01T17:07:48Z

GH-26091 added the _typevar_types and _paramspec_tvars instance variables to _GenericAlias. However, they were not propagated consistently. This commit addresses the most prominent deficiency identified in bpo-46581 (namely their absence from _GenericAlias.copy_with), but there could be others.

https://bugs.python.org/issue46581

Lib/typing.py

Lib/test/test_genericalias.py

posita · 2022-02-19T05:51:21Z

~~Ah! Crap. Sorry for the force-push that moved us backward. Let me rebase and push again….~~ Should be cleaned up now. Apologies for the distraction!

Lib/typing.py

Requested [here](python#31061 (comment)).

) (cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

(cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

Lib/typing.py

serhiy-storchaka

There is more straightforward way to fix a conflict.

Add _typevar_types=(TypeVar, ParamSpec), _paramspec_tvars=True to the call of _ConcatenateGenericAlias in _Concatenate.
Remove _ConcatenateGenericAlias.__initt__.
Remove a special case from _GenericAlias.copy_with.

Also please move changes in comments and docstrings to enother PR. They distract.

Misc/NEWS.d/next/Library/2022-02-01-11-32-47.bpo-46581.t7Zw65.rst

bedevere-bot · 2022-03-06T14:48:01Z

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.

JelleZijlstra · 2022-03-10T04:53:20Z

Lib/test/test_typing.py

+        original = Callable[P, int]
+        self.assertEqual(original.__parameters__, (P,))
+        copied = original[P]
+        self.assertEqual(original.__parameters__, copied.__parameters__)


Could you add some more complicated test cases? Ideas:

The original has a Concatenate[int, P] in it (original = Callable[Concatenate[int, P], int]; original[P].__paramaters__ == (P,))

Instead of substituting a P in, substitute in a Concatenate or something like [int, T], and then the T should be in __parameters__.

Lib/test/test_typing.py

serhiy-storchaka · 2022-03-10T13:17:33Z

Lib/test/test_typing.py

+        P2 = ParamSpec('P2')
+        C1 = Callable[P, int]
+        self.assertEqual(C1.__parameters__, (P,))
+        self.assertEqual(C1[P2].__parameters__, (P2,))


Only this test was failed.

Fidget-Spinner

Thank you for pulling through @posita . This was a pretty tricky PR.

miss-islington · 2022-03-10T14:42:19Z

Thanks @posita for the PR, and @serhiy-storchaka for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖

miss-islington · 2022-03-10T14:42:35Z

Sorry, @posita and @serhiy-storchaka, I could not cleanly backport this to 3.10 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 32bf3597922ac3f613989582afa2bff43bea8a2f 3.10

posita · 2022-03-10T20:01:08Z

Sorry, @posita and @serhiy-storchaka, I could not cleanly backport this to 3.10 due to a conflict. Please backport using cherry_picker on command line. cherry_picker 32bf3597922ac3f613989582afa2bff43bea8a2f 3.10

Should I work on resolving this?

JelleZijlstra · 2022-03-10T20:02:09Z

Yes please :) Let me know if you need any help.

posita · 2022-03-11T13:30:22Z

I would love a nudge on where to learn how to do this manually. (I'm unfamiliar with the process.) Is it as simple as resolving any conflicts against the 3.10 branch and then submitting a PR or is there more involved?

Fidget-Spinner · 2022-03-11T13:34:34Z

I would love a nudge on where to learn how to do this manually. (I'm unfamiliar with the process.) Is it as simple as resolving any conflicts against the 3.10 branch and then submitting a PR or is there more involved?

Yup. Submit a PR against the 3.10 and/or 3.9 branch after resolving conflicts.

The bot is a little off. An easier way without installing things is to use the git cherry-pick command directly. StackOverflow link here does a great job explaining it.

The other even easier alternative if you're using GitHub desktop, is to drag and drop the commit from the left panel from main into your new branch that is based off 3.10/3.9. The app will then warn you about conflicts, and you can resolve them in a code editor (this means accepting/rejecting changes or overwriting them altogether manually).

…ythonGH-31061) (Cherry-picked from 32bf359.) pythonGH-26091 added the _typevar_types and _paramspec_tvars instance variables to _GenericAlias. However, they were not propagated consistently. This commit addresses the most prominent deficiency identified in bpo-46581 (namely their absence from _GenericAlias.copy_with), but there could be others. Co-authored-by: Ken Jin <[email protected]> Co-authored-by: Serhiy Storchaka <[email protected]>

bedevere-bot · 2022-03-11T13:58:43Z

GH-31821 is a backport of this pull request to the 3.10 branch.

posita · 2022-03-11T14:10:50Z

I would love a nudge on where to learn how to do this manually. (I'm unfamiliar with the process.) Is it as simple as resolving any conflicts against the 3.10 branch and then submitting a PR or is there more involved?

Yup. Submit a PR against the 3.10 and/or 3.9 branch after resolving conflicts.

…

Thanks @Fidget-Spinner! Cherry-picking is all good. I just didn't know if there was other repo- or CI-specific magical incantations I needed to invoke or procedures I needed to follow.

Question (maybe for @JelleZijlstra): This is marked as needed a back-port to 3.10, but not to 3.9. Should this also be back-ported to 3.9?

…H-31061) (GH-31821) (Cherry-picked from 32bf359.) GH-26091 added the _typevar_types and _paramspec_tvars instance variables to _GenericAlias. However, they were not propagated consistently. This commit addresses the most prominent deficiency identified in bpo-46581 (namely their absence from _GenericAlias.copy_with), but there could be others. Co-authored-by: Ken Jin <[email protected]> Co-authored-by: Serhiy Storchaka <[email protected]> Co-authored-by: Ken Jin <[email protected]> Co-authored-by: Serhiy Storchaka <[email protected]>

Fidget-Spinner · 2022-03-11T15:17:55Z

@posita re backporting to 3.9, we don't need it as pre-3.10 ParamSpec didn't exist so we never needed these parameters then.

Anyways, congrats on becoming a CPython contributor!

posita · 2022-03-11T15:37:29Z

@posita re backporting to 3.9, we don't need it as pre-3.10 ParamSpec didn't exist so we never needed these parameters then.

Oh, right! Duh. Thanks all! I very much appreciate all the hand-holding.

) (cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

posita requested review from Fidget-Spinner and gvanrossum as code owners February 1, 2022 17:07

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Initial attempt a caching protocol implementation beartype/beartype#86

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The Future Sound of Beartype: Going Deep on Type-checking beartype/beartype#7

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Copy edits from python#31061

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Requested [here](python#31061 (comment)).

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Lib/typing.py copy edits originating from GH-31061 #31684

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Lib/typing.py copy edits originating from GH-31061 (#31684)

2031149

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Lib/typing.py copy edits originating from pythonGH-31061 (pythonGH-31684

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) (cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

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) (cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

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Lib/typing.py copy edits originating from GH-31061 (GH-31684)

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(cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

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Lib/typing.py copy edits originating from GH-31061 (GH-31684)

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(cherry picked from commit 2031149) Co-authored-by: Matt Bogosian <[email protected]>

posita mentioned this pull request Mar 5, 2022

Ruh-roh! CACHING protocols? More like CRASHING protocols (in 3.7)! Amirite? beartype/beartype#109

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Move test to ParamSpecTests

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bpo-46581: Propagate private vars via _GenericAlias.copy_with #31061

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bpo-46581: Propagate private vars via _GenericAlias.copy_with #31061

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