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

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

docs_src/dependencies/tutorial001_py310.py

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+from fastapi import Depends, FastAPI
+
+app = FastAPI()
+
+
+async def common_parameters(q: str | None = None, skip: int = 0, limit: int = 100):
+    return {"q": q, "skip": skip, "limit": limit}
+
+
+@app.get("/items/")
+async def read_items(commons: dict = Depends(common_parameters)):
+    return commons
+
+
+@app.get("/users/")
+async def read_users(commons: dict = Depends(common_parameters)):
+    return commons

docs_src/dependencies/tutorial002_py310.py

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+from fastapi import Depends, FastAPI
+
+app = FastAPI()
+
+
+fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]
+
+
+class CommonQueryParams:
+    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
+        self.q = q
+        self.skip = skip
+        self.limit = limit
+
+
+@app.get("/items/")
+async def read_items(commons: CommonQueryParams = Depends(CommonQueryParams)):
+    response = {}
+    if commons.q:
+        response.update({"q": commons.q})
+    items = fake_items_db[commons.skip : commons.skip + commons.limit]
+    response.update({"items": items})
+    return response

docs_src/dependencies/tutorial003_py310.py

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+from fastapi import Depends, FastAPI
+
+app = FastAPI()
+
+
+fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]
+
+
+class CommonQueryParams:
+    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
+        self.q = q
+        self.skip = skip
+        self.limit = limit
+
+
+@app.get("/items/")
+async def read_items(commons=Depends(CommonQueryParams)):
+    response = {}
+    if commons.q:
+        response.update({"q": commons.q})
+    items = fake_items_db[commons.skip : commons.skip + commons.limit]
+    response.update({"items": items})
+    return response

docs_src/dependencies/tutorial004_py310.py

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+from fastapi import Depends, FastAPI
+
+app = FastAPI()
+
+
+fake_items_db = [{"item_name": "Foo"}, {"item_name": "Bar"}, {"item_name": "Baz"}]
+
+
+class CommonQueryParams:
+    def __init__(self, q: str | None = None, skip: int = 0, limit: int = 100):
+        self.q = q
+        self.skip = skip
+        self.limit = limit
+
+
+@app.get("/items/")
+async def read_items(commons: CommonQueryParams = Depends()):
+    response = {}
+    if commons.q:
+        response.update({"q": commons.q})
+    items = fake_items_db[commons.skip : commons.skip + commons.limit]
+    response.update({"items": items})
+    return response

docs_src/dependencies/tutorial005_py310.py

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+from fastapi import Cookie, Depends, FastAPI
+
+app = FastAPI()
+
+
+def query_extractor(q: str | None = None):
+    return q
+
+
+def query_or_cookie_extractor(
+    q: str = Depends(query_extractor), last_query: str | None = Cookie(None)
+):
+    if not q:
+        return last_query
+    return q
+
+
+@app.get("/items/")
+async def read_query(query_or_default: str = Depends(query_or_cookie_extractor)):
+    return {"q_or_cookie": query_or_default}