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Check list multiplication operands in evaluation order - #22263

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hauntsaninja merged 1 commit into
python:masterfrom
hauntsaninja:multi
Oct 25, 2026
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hauntsaninja merged 1 commit into
python:masterfrom
hauntsaninja:multi

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Check the list first, using the outer context because list repetition preserves the item type (this code path doesn't look at rmul), and let the operator checker handle the multiplier. Also the code path works for SupportsIndex now

Authored by Codex

Check the list first, using the outer context because list repetition
preserves the item type, and let the operator checker handle the
multiplier.

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

sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/testing/util.py:80:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

scipy-stubs (https://github.com/scipy/scipy-stubs)
- tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

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LG!

@hauntsaninja
hauntsaninja merged commit 5b0b7f9 into python:master Oct 25, 2026
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@hauntsaninja
hauntsaninja deleted the multi branch October 25, 2026 03:50
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2 participants