from datetime import datetime

from typing import List, Optional

from pydantic import BaseModel

class User(BaseModel):

id: int

name = "John Doe"

signup_ts: Optional[datetime] = None

friends: List[int] = []

external_data = {

"id": "123",

"signup_ts": "2017-06-01 12:22",

"friends": [1, "2", b"3"],

}

user = User(**external_data)

print(user)

# > User id=123 name='John Doe' signup_ts=datetime.datetime(2017, 6, 1, 12, 22) friends=[1, 2, 3]

print(user.id)

# > 123