📝 Update source examples and docs from Python 3.9 to 3.10 (#14900)

docs_src/dataclasses_/tutorial001_py39.py

@@ -1,20 +0,0 @@
-from dataclasses import dataclass
-from typing import Union
-
-from fastapi import FastAPI
-
-
-@dataclass
-class Item:
-    name: str
-    price: float
-    description: Union[str, None] = None
-    tax: Union[float, None] = None
-
-
-app = FastAPI()
-
-
-@app.post("/items/")
-async def create_item(item: Item):
-    return item

docs_src/dataclasses_/tutorial002_py39.py

@@ -1,26 +0,0 @@
-from dataclasses import dataclass, field
-from typing import Union
-
-from fastapi import FastAPI
-
-
-@dataclass
-class Item:
-    name: str
-    price: float
-    tags: list[str] = field(default_factory=list)
-    description: Union[str, None] = None
-    tax: Union[float, None] = None
-
-
-app = FastAPI()
-
-
-@app.get("/items/next", response_model=Item)
-async def read_next_item():
-    return {
-        "name": "Island In The Moon",
-        "price": 12.99,
-        "description": "A place to be playin' and havin' fun",
-        "tags": ["breater"],
-    }

docs_src/dataclasses_/tutorial003_py39.py

@@ -1,55 +0,0 @@
-from dataclasses import field  # (1)
-from typing import Union
-
-from fastapi import FastAPI
-from pydantic.dataclasses import dataclass  # (2)
-
-
-@dataclass
-class Item:
-    name: str
-    description: Union[str, None] = None
-
-
-@dataclass
-class Author:
-    name: str
-    items: list[Item] = field(default_factory=list)  # (3)
-
-
-app = FastAPI()
-
-
-@app.post("/authors/{author_id}/items/", response_model=Author)  # (4)
-async def create_author_items(author_id: str, items: list[Item]):  # (5)
-    return {"name": author_id, "items": items}  # (6)
-
-
-@app.get("/authors/", response_model=list[Author])  # (7)
-def get_authors():  # (8)
-    return [  # (9)
-        {
-            "name": "Breaters",
-            "items": [
-                {
-                    "name": "Island In The Moon",
-                    "description": "A place to be playin' and havin' fun",
-                },
-                {"name": "Holy Buddies"},
-            ],
-        },
-        {
-            "name": "System of an Up",
-            "items": [
-                {
-                    "name": "Salt",
-                    "description": "The kombucha mushroom people's favorite",
-                },
-                {"name": "Pad Thai"},
-                {
-                    "name": "Lonely Night",
-                    "description": "The mostests lonliest nightiest of allest",
-                },
-            ],
-        },
-    ]