Refactor: simplify combine_function_signatures by reducing line count and preserving comments #19196
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…eserving original comments
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sterliakov
reviewed
Jun 1, 2025
mypy/checkexpr.py
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| new_returns: list[Type] = [] | ||
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| new_args: list[list[Type]] = [[] for _ in callables[0].arg_types] | ||
| new_kinds, new_returns = list(callables[0].arg_kinds), [] |
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This looks like a penalty to readability rather than refactoring, why merge two unrelated assignments?
mypy/checkexpr.py
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| break | ||
| for i, (new_kind, target_kind) in enumerate(zip(new_kinds, target.arg_kinds)): | ||
| if new_kind == target_kind: | ||
| for i, (k1, k2) in enumerate(zip(new_kinds, target.arg_kinds)): |
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I think new_ and target_ prefixes are much clearer than k1 and k2...
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| return callables[0].copy_modified( | ||
| arg_types=final_args, | ||
| arg_types=[make_simplified_union(args) for args in new_args], |
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This is definitely an improvement!
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Diff from mypy_primer, showing the effect of this PR on open source code: nox (https://github.com/wntrblm/nox): 1.31x slower (30.9s -> 40.5s in single noisy sample)
typeshed-stats (https://github.com/AlexWaygood/typeshed-stats): 1.55x slower (66.3s -> 102.5s in single noisy sample)
materialize (https://github.com/MaterializeInc/materialize): 1.06x slower (135.9s -> 144.5s in single noisy sample)
imagehash (https://github.com/JohannesBuchner/imagehash): 1.06x slower (74.0s -> 78.8s in single noisy sample)
discord.py (https://github.com/Rapptz/discord.py): 1.10x slower (281.1s -> 308.0s in single noisy sample)
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This pull request contributes to issue #5917, which encourages the decomposition and simplification of overly long methods to improve code clarity and maintainability.
Summary of changes
Refactored the
combine_function_signaturesmethod to reduce line count and eliminate redundancy, while preserving all original logic and explanatory comments.Key improvements:
Notes