Asosiy ko‘rinish

from typing import List, Dict, Optional

def add(a: int, b: int) -> int:
    return a + b

nums: List[int] = [1, 2, 3]
user: Dict[str, Optional[int]] = {"age": None}

mypy bilan tekshirish

pip install mypy
mypy your_project/

dataclass + typing

from dataclasses import dataclass
from typing import Optional

@dataclass
class User:
    name: str
    age: Optional[int] = None