I would like to create custom Python type hint that would effectively be
MyType = Dict[str, <some_type>]
Then I would like to be able to spesify MyType like MyType[<some_type>], for example
MyType[List[str]] which would mean Dict[str, List[str]].
I haven't been able to figure out how to do this.
I've tried MyType = Dict[str, Any] but I don't know how to make Any be a variable. Any suggestions?
Does Generics answer your question?
from typing import TypeVar, Dict, List
X = TypeVar('X')
MyType = Dict[str, X]
def test_f(d: MyType[List[str]]) -> bool:
pass
If you're using Python 3.9 or newer, you can use standard collections directly:
StrList = list[str]
MyType = dict[str, StrList]
If you're using Python 3.7 or 3.8, you can still use the new notation via
from __future__ import annotations
Note: __future__ import statements must be located at the very top of a module
