pydantic_basemodel_schema_definition_and_data_validation.py

1from datetime import datetime
2from typing import List, Optional
3from pydantic import BaseModel
4
5class User(BaseModel):
6    id: int
7    name: str = 'John Doe'
8    signup_ts: Optional[datetime] = None
9    friends: List[int] = []
10
11external_data = {
12    'id': '123',
13    'signup_ts': '2019-06-01 12:22',
14    'friends': [1, 2, '3'],
15}
16
17user = User(**external_data)
18
19print(user.id)
20#> 123
21print(repr(user.signup_ts))
22#> datetime.datetime(2019, 6, 1, 12, 22)
23print(user.friends)
24#> [1, 2, 3]
25print(user.dict())
26"""
27{
28    'id': 123,
29    'signup_ts': datetime.datetime(2019, 6, 1, 12, 22),
30    'friends': [1, 2, 3],
31    'name': 'John Doe',
32}
33"""