read_item

main.py

@@ -1,4 +1,5 @@
 from fastapi import FastAPI
+from typing import Union
 
 app = FastAPI()
 
@@ -6,3 +7,8 @@ app = FastAPI()
 @app.get("/")
 def read_root():
     return {"Hello": "World!"}
+
+
+@app.get("/items/{item_id}")
+def read_item(item_id: int, q: Union[str, None] = None):
+    return {"item_id": item_id, "q": q}