✨ Add docs and tests for Python 3.9 and Python 3.10 (#3712)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>

docs_src/extra_models/tutorial001_py310.py

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+from fastapi import FastAPI
+from pydantic import BaseModel, EmailStr
+
+app = FastAPI()
+
+
+class UserIn(BaseModel):
+    username: str
+    password: str
+    email: EmailStr
+    full_name: str | None = None
+
+
+class UserOut(BaseModel):
+    username: str
+    email: EmailStr
+    full_name: str | None = None
+
+
+class UserInDB(BaseModel):
+    username: str
+    hashed_password: str
+    email: EmailStr
+    full_name: str | None = None
+
+
+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.dict(), 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

docs_src/extra_models/tutorial002_py310.py

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+from fastapi import FastAPI
+from pydantic import BaseModel, EmailStr
+
+app = FastAPI()
+
+
+class UserBase(BaseModel):
+    username: str
+    email: EmailStr
+    full_name: 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.dict(), 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

docs_src/extra_models/tutorial003_py310.py

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+from typing import Union
+
+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class BaseItem(BaseModel):
+    description: str
+    type: str
+
+
+class CarItem(BaseItem):
+    type = "car"
+
+
+class PlaneItem(BaseItem):
+    type = "plane"
+    size: int
+
+
+items = {
+    "item1": {"description": "All my friends drive a low rider", "type": "car"},
+    "item2": {
+        "description": "Music is my aeroplane, it's my aeroplane",
+        "type": "plane",
+        "size": 5,
+    },
+}
+
+
+@app.get("/items/{item_id}", response_model=Union[PlaneItem, CarItem])
+async def read_item(item_id: str):
+    return items[item_id]

docs_src/extra_models/tutorial004_py39.py

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+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str
+
+
+items = [
+    {"name": "Foo", "description": "There comes my hero"},
+    {"name": "Red", "description": "It's my aeroplane"},
+]
+
+
+@app.get("/items/", response_model=list[Item])
+async def read_items():
+    return items

docs_src/extra_models/tutorial005_py39.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/keyword-weights/", response_model=dict[str, float])
+async def read_keyword_weights():
+    return {"foo": 2.3, "bar": 3.4}