app.py

import numpy as np
import gradio as gr

def mycalculator(in_num_a,in_num_b,method):
    if method == "add":
        return in_num_a + in_num_b
    if method == "minus":
        return in_num_a - in_num_b
    if method == "multiply":
        return in_num_a * in_num_b
    if method ==  "divide":
        if in_num_b!=0.0:
            return in_num_a/in_num_b
        else:
            return np.nan

demo = gr.Interface(
    fn=mycalculator,
    inputs=[
        gr.Number(precision=5,label="a"),
        gr.Number(precision=5,label="b"),
        gr.Radio(["add","minus","multiply","divide"])
    ],
    outputs="number")

demo.launch()