Pylance Generic class type cannot be assigned from typing.get_args()

Question

I have a Literal type of particular string values. I'm trying to generate a list of those strings as well dynamically:

from typing import List, Literal, get_args

Color = Literal['red', 'green', 'blue']

colors = List[Color] = get_args(Color)

The third line at List is throwing this error:

Generic class type cannot be assigned    Pylance(reportGeneralTypeIssues)

I'm attempting to replicate this answer https://stackoverflow.com/a/64522240/12574341

The equivalent of what the other answer shows is `colors: List[Color] = get_args(Color)`. Note the colon. — MisterMiyagi, Oct 13 '22 at 11:36

score 1 · Answer 1 · answered Oct 13 '22 at 08:08

There should be a colon instead of an equal sign. If you want to make it a list, a type cast is required to cast from tuple[Any, ...] to list[Color].

from typing import cast, Literal, get_args


Color = Literal["red", "green", "blue"]

colors = cast(list[Color], list(get_args(Color)))

Pylance Generic class type cannot be assigned from typing.get_args()

1 Answers1