from pydantic import BaseModel, Field from typing import Optional class CountryBase(BaseModel): name: str = Field(..., min_length=1, max_length=100) code: str = Field(..., min_length=2, max_length=2) class CountryCreate(CountryBase): class Config: schema_extra = { "example": { "name": "United States", "code": "US" } } class Country(CountryBase): id: int class Config: orm_mode = True schema_extra = { "example": { "id": 1, "name": "United States", "code": "US" } }