typing: property/setter and lists?

[Peter Otten]

On 03/11/2022 04:24, Paulo da Silva wrote:
> Hi!
>
> And a typing problem again!!!
> _______________________________________
> class C:
>      def __init__(self):
>          self.__foos=5*[0]
>
>      @property
>      def foos(self) -> list[int]:
>          return self.__foos
>
>      @foos.setter
>      def foos(self,v: int):
>          self.__foos=[v for __i in self.__foos]
>
> c=C()
> c.foos=5
> print(c.foos)
> _______________________________________
>
> mypy gives the following error:
> error: Incompatible types in assignment (expression has type "int",
> variable has type "List[int]")
>
> How do I turn around this?

Quoting https://github.com/python/mypy/issues/3004:

"""
gvanrossum commented on Mar 15, 2017
IIRC we debated a similar issues when descriptors were added and decided
that it's a perverse style that we just won't support. If you really
have this you can add # type: ignore.
"""