8000 improve `ndarray.__getitem__` with rank-typing · Issue #557 · numpy/numtype · GitHub
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improve ndarray.__getitem__ with rank-typing #557

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jorenham opened this issue May 15, 2025 · 0 comments
Open

improve ndarray.__getitem__ with rank-typing #557

jorenham opened this issue May 15, 2025 · 0 comments
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numpy.ndarray stubs: Enhancement topic: shape-typing

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jorenham commented May 15, 2025 •
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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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