1from typing import Optional
 2from fastapi import FastAPI
 3fromt pydantic import BaseModel
 4
 5app = FastAPI()
 6
 7@app.get("/")
 8def read_root():
 9    return {"Hello": "Universe"}
10
11# /items/1
12# /items/2
13@app.get("/items/{item_id}")
14def read_item(item_id: int, q: Optional[str] = None):
15    return {"item_id": item_id, "q": q}