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

docs_src/background_tasks/tutorial001_py310.py

@@ -0,0 +1,15 @@
+from fastapi import BackgroundTasks, FastAPI
+
+app = FastAPI()
+
+
+def write_notification(email: str, message=""):
+    with open("log.txt", mode="w") as email_file:
+        content = f"notification for {email}: {message}"
+        email_file.write(content)
+
+
+@app.post("/send-notification/{email}")
+async def send_notification(email: str, background_tasks: BackgroundTasks):
+    background_tasks.add_task(write_notification, email, message="some notification")
+    return {"message": "Notification sent in the background"}

docs_src/background_tasks/tutorial002_an_py39.py

@@ -1,26 +0,0 @@
-from typing import Annotated, Union
-
-from fastapi import BackgroundTasks, Depends, FastAPI
-
-app = FastAPI()
-
-
-def write_log(message: str):
-    with open("log.txt", mode="a") as log:
-        log.write(message)
-
-
-def get_query(background_tasks: BackgroundTasks, q: Union[str, None] = None):
-    if q:
-        message = f"found query: {q}\n"
-        background_tasks.add_task(write_log, message)
-    return q
-
-
-@app.post("/send-notification/{email}")
-async def send_notification(
-    email: str, background_tasks: BackgroundTasks, q: Annotated[str, Depends(get_query)]
-):
-    message = f"message to {email}\n"
-    background_tasks.add_task(write_log, message)
-    return {"message": "Message sent"}

docs_src/background_tasks/tutorial002_py39.py

@@ -1,26 +0,0 @@
-from typing import Union
-
-from fastapi import BackgroundTasks, Depends, FastAPI
-
-app = FastAPI()
-
-
-def write_log(message: str):
-    with open("log.txt", mode="a") as log:
-        log.write(message)
-
-
-def get_query(background_tasks: BackgroundTasks, q: Union[str, None] = None):
-    if q:
-        message = f"found query: {q}\n"
-        background_tasks.add_task(write_log, message)
-    return q
-
-
-@app.post("/send-notification/{email}")
-async def send_notification(
-    email: str, background_tasks: BackgroundTasks, q: str = Depends(get_query)
-):
-    message = f"message to {email}\n"
-    background_tasks.add_task(write_log, message)
-    return {"message": "Message sent"}