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Fix string formatting for string enums #16555

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merged 1 commit into from Apr 8, 2024

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roberfi
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@roberfi roberfi commented Nov 24, 2023

Fixes #7563

Inside check_str_format_call method, it checks if expression of format method call is an Enum member and it takes Literal value of that Enum member to check the format call arguments, if so.

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Diff from mypy_primer, showing the effect of this PR on open source code:

discord.py (https://github.com/Rapptz/discord.py): typechecking got 1.09x faster (194.1s -> 178.0s)
(Performance measurements are based on a single noisy sample)

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@hauntsaninja hauntsaninja left a comment

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Thanks for the fix!

@hauntsaninja hauntsaninja merged commit 732d98e into python:master Apr 8, 2024
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@roberfi roberfi deleted the fix-string-enums-formatting branch April 10, 2024 12:29
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Using string enums with string formatting may cause false positives
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