NameError: name 'List' is not defined

Question

I\'m really unsure why this isn\'t working. Here is the important part of the code (it\'s from a leetcode challenge). The first line throws the NameError.

Answer 1

To be able to annotate what types your list should accept, you need to use typing.List

from typing import List

So did you import List?

Update

If you're using Python 3.9, see @Adam.Er8's answer