Instantiate python type-hinted list to empty

Question

I have some python that does this:

from typing import List, NewType

MultiList = NewType("MultiList", List[List[int]])

def myfunc():
  multi: MultiList = []
  # More stuff here

The code works fine, it's just my IDE (PyCharm) doesn't like the instantiation of multi to an empty list, I get this error:

"Expected type 'MultiList', got 'list[list[int]]' instead"

I mean, a MultiListisa list[list[int]], so I really don't know why it's complaining. Unless it's because the list is empty, but that doesn't make a lot of sense to me either.

It's not the end of the world, the code works just fine, I'd just like to know why it's "wrong", per se.

Answer 1

If you just mean "list of lists of ints", then don't use NewType:

MultiList = List[List[int]]