Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/extra_models/tutorial002_py39.py

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+from typing import Union
+
+from fastapi import FastAPI
+from pydantic import BaseModel, EmailStr
+
+app = FastAPI()
+
+
+class UserBase(BaseModel):
+    username: str
+    email: EmailStr
+    full_name: Union[str, None] = None
+
+
+class UserIn(UserBase):
+    password: str
+
+
+class UserOut(UserBase):
+    pass
+
+
+class UserInDB(UserBase):
+    hashed_password: str
+
+
+def fake_password_hasher(raw_password: str):
+    return "supersecret" + raw_password
+
+
+def fake_save_user(user_in: UserIn):
+    hashed_password = fake_password_hasher(user_in.password)
+    user_in_db = UserInDB(**user_in.model_dump(), hashed_password=hashed_password)
+    print("User saved! ..not really")
+    return user_in_db
+
+
+@app.post("/user/", response_model=UserOut)
+async def create_user(user_in: UserIn):
+    user_saved = fake_save_user(user_in)
+    return user_saved