app.py

from fastapi import FastAPI
from pydantic import BaseModel


class User_input(BaseModel):
    operation:str
    x:float
    y:float

def calculate(operation, x, y):
    return x/y

app = FastAPI()

@app.get("/hello")
def greet_json():
    return {"Hello": "World!"}


@app.post("/calculate")
def operate(input:User_input):
    res= calculate(input.operation, input.x, input.y)
    return res