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Wrong type inference for <tuple>[s] where s: slice #21708

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@bzoracler

Bug Report

a = (1, 2, 3)
s = slice(None, 1)
reveal_type(a[s])  # Revealed type is `builtins.int`
reveal_type(a.__getitem__(s))  # Revealed type is `builtins.tuple[builtins.int, ...]` (OK)

The runtime value of a[s] is (1,).

The type inference works for lists though.

Your Environment

  • Mypy version used: 1.0.0-2.1, master
  • Python version used: 3.12, 3.13

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