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

Since Python 3.9, you can use built-in collection types (such as list) as generic types, instead of importing the corresponding capitalized types from typing.
This is thanks to PEP 585

So in Python 3.9 or newer, you could actually write:

def totalFruit(self, tree: list[int]) -> int: # Note list instead of List
    pass

without having to import anything.