TYP: transpose and matrix_transpose improved shape-typing - #32271
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charris merged 2 commits intoAug 12, 2026
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Diff from mypy_primer, showing the effect of this PR on type check results on a corpus of open source code: optuna (https://github.com/optuna/optuna)
./optuna/study/_multi_objective.py:182: error: INTERNAL ERROR -- Please try using mypy master on GitHub:
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Thanks Joren. |
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This adds overloads to the transpose functions for shaped-typed results of (nesdted) sequences of Python builtins.
The
transposeandmatrix_transposeoverloads are isomorphic, and the functions clearly related, hence this two-for-one.Fun fact: according to the AI shape-typing audit (gist),
matrix_transposeis the least popular non-legacy NumPy function in the main namespace.Fully written by me, audited as kinda-high-value shape-typing improvement by AI (see gist).