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

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

docs_src/query_params_str_validations/tutorial001_py310.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str | None = None):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial002_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str | None = Query(None, max_length=50)):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial003_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str | None = Query(None, min_length=3, max_length=50)):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial004_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(
+    q: str | None = Query(None, min_length=3, max_length=50, regex="^fixedquery$")
+):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial007_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str | None = Query(None, title="Query string", min_length=3)):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial008_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(
+    q: str
+    | None = Query(
+        None,
+        title="Query string",
+        description="Query string for the items to search in the database that have a good match",
+        min_length=3,
+    )
+):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial009_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str | None = Query(None, alias="item-query")):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial010_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(
+    q: str
+    | None = Query(
+        None,
+        alias="item-query",
+        title="Query string",
+        description="Query string for the items to search in the database that have a good match",
+        min_length=3,
+        max_length=50,
+        regex="^fixedquery$",
+        deprecated=True,
+    )
+):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results

docs_src/query_params_str_validations/tutorial011_py310.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: list[str] | None = Query(None)):
+    query_items = {"q": q}
+    return query_items

docs_src/query_params_str_validations/tutorial011_py39.py

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+from typing import Optional
+
+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: Optional[list[str]] = Query(None)):
+    query_items = {"q": q}
+    return query_items

docs_src/query_params_str_validations/tutorial012_py39.py

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+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: list[str] = Query(["foo", "bar"])):
+    query_items = {"q": q}
+    return query_items