Path_Parameter.py

from typing import Optional
from fastapi import FastAPI,Path,Query

app=  FastAPI()

@app.get("/items/{item_id}")
async def read_items(item_id:int = Path(...,title="title",ge=1, le=100), q: Optional[str] = Query(None, alias="item-query")):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})
    return results