Detect invalid attribute assignment for NamedTuple

[cdce8p]

from typing import NamedTuple

class Car(NamedTuple):
    color: str
    mileage: int
    automatic: bool

car1 = Car('red', 0, True)
car1.mileage = 42  # error

This will result in AttributeError: can't set attribute during runtime. I think it would be nice if pylance / pyright could detect it.

This already happens for __setitem__ calls (although this would raise a TypeError).

car1[1] = 42

"__setitem__" method not defined on type "Car"

[erictraut]

Thanks for the the enhancement request. I've created a tracking bug in the pyright issue tracker.

[erictraut]

This will be included in the next release.

[bschnurr]

This issue has been fixed in version 2021.10.3, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/main/CHANGELOG.md#2021103-27-october-2021