Mypy micro-optimizations (batch 1/3) #19768
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| According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
hauntsaninja approved these changes Aug 31, 2025
cdce8p reviewed Sep 1, 2025
Comment on lines -2126 to +2128
| self.variables = variables | ||
| self.variables: tuple[TypeVarLikeType, ...] | ||
| if variables is None: | ||
| self.variables = () | ||
| else: | ||
| self.variables = tuple(variables) |
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Note, this does crash the pydantic.v1 extension.
File "/.../python3.13/site-packages/pydantic/v1/mypy.py", line 868, in add_method signature.variables = [tvar_def] ^^^^^^^^^^^^^^^^^^^ TypeError: tuple object expected; got listhttps://github.com/pydantic/pydantic/blob/v2.11.7/pydantic/v1/mypy.py#L866-L868
It can fairly easily be fixed and I'll open a PR for it soon. However, that might not be the only plugin which depends on it being "just" a sequence.
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If we have evidence that this impacts multiple plugins, we can consider reverting this change.
This was referenced Sep 1, 2025
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Several mypy micro-optimizations. Together with batches 2 and 3 these improve self check performance by 1.8%.