improve `ndarray.getitem` with rank-typing

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#557 opened on May 15, 2025 2 comments 0 reactions 1 assignee View on GitHub

@jorenham is already working on this.

Since May 15, 2025.

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numpy.ndarray stubs: Enhancement topic: shape-typing

It's a very complicated method signature, e.g.

_[()] returns Self if 1d+, otherwise (if 0d) returns its scalar type
_[int] returns Self[DTypeT, ShapeT[1:]] if 1d+, otherwise (if 0d) returns its scalar type
_[int, int] returns Self[DTypeT, ShapeT[1:]] if 1d+, otherwise (if 0d) returns its scalar type
...
_[None] returns array[DTypeT, (int, *ShapeT)]
_[None, None] returns array[DTypeT, (int, int, *ShapeT)]
...
_[slice | array-indexer] returns Self for 1d+, otherwise rejects
_[slice | array-indexer, slice | array-indexer] returns Self for 2d+, otherwise rejects
...
_[...] returns Self for 0d+

almost all possible combinations are also valid 😅

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