Example Code From Typing Library Causes TypeError: 'type' Object Is Not Subscriptable, Why?

Considering to Python Docs for typing why code below isn't working? >>> Vector = list[float] Traceback (most recent call last): File '', line 1, in

Solution 1:

The ability to use the [] operator on types like list for type hinting was added in 3.9.

https://docs.python.org/3/whatsnew/3.9.html#type-hinting-generics-in-standard-collections

In earlier versions it will generate the error you describe, and you need to import List object from typing instead.

from typing import List
List[float]

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