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from pydantic import BaseModel, EmailStr, field_validator from typing import Optional class User(BaseModel): id: int name: str email: EmailStr role: Optional[str] = "user" @field_validator("name") def name_not_empty(cls, v): if not v.strip(): raise ValueError("Name cannot be blank") return v user = User.model_validate({"id": 1, "name": "Alice", "email": "alice@example.com"}) print(user.model_dump_json())
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