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min key signature deduced incorrectly #11675

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ikonst opened this issue Dec 7, 2021 · 2 comments
Closed

min key signature deduced incorrectly #11675

ikonst opened this issue Dec 7, 2021 · 2 comments
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bug mypy got something wrong

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@ikonst
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ikonst commented Dec 7, 2021 

from typing import *

lst = [1, 2, 3]

ok = min(lst, key=lambda val: val * 2, default=None)
also_ok: Optional[int] = min(lst, key=lambda val: val * 2)
not_ok: Optional[int] = min(lst, key=lambda val: val * 2, default=None)

results in:

main.py:7: error: Unsupported operand types for * ("None" and "int")
main.py:7: note: Left operand is of type "Optional[int]"
Found 1 error in 1 file (checked 1 source file)

https://mypy-play.net/?mypy=latest&python=3.10&gist=d1b9d6d966eba554375172c9826f8d6e
@ikonst ikonst added the bug mypy got something wrong label Dec 7, 2021
@ikonst
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ikonst commented Dec 7, 2021

OK, seems to be a dup of #6692

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ikonst commented Dec 7, 2021

Itself a dup of #5874

@ikonst ikonst closed this as completed Dec 7, 2021
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