Remove py39 code example

docs_src/query_params_str_validations/tutorial006c_an_py39.py

@@ -1,22 +0,0 @@
-from typing import Annotated, Union
-
-from fastapi import FastAPI, Query
-from pydantic import BeforeValidator
-
-app = FastAPI()
-
-
-def nullable_str(val: str) -> Union[str, None]:
-    if val in ("None", "", "null"):
-        return None
-    return val
-
-
-@app.get("/items/")
-async def read_items(
-    q: Annotated[Union[str, None], Query(min_length=3), BeforeValidator(nullable_str)],
-):
-    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
-    if q:
-        results.update({"q": q})
-    return results

tests/test_tutorial/test_query_params_str_validations/test_tutorial006c.py

@@ -3,14 +3,11 @@ import importlib
 import pytest
 from fastapi.testclient import TestClient
 
-from ...utils import needs_py310
-
 
 @pytest.fixture(
     name="client",
     params=[
-        pytest.param("tutorial006c_an_py39"),
+        "tutorial006c_an_py310",
-        pytest.param("tutorial006c_an_py310", marks=needs_py310),
     ],
 )
 def get_client(request: pytest.FixtureRequest):