app.py

import gradio as gr

def calculator(num1, operation, num2):
    if operation == "add":
        return num1 + num2
    elif operation == "subtract":
        return num1 - num2
    elif operation == "multiply":
        return num1 * num2
    elif operation == "divide":
        return num1 / num2


demo = gr.Interface(
    fn=calculator,
    inputs=[
            gr.Number(value=4), 
            gr.Radio(["add", "subtract", "multiply", "divide"]), 
            "number"
            ],
    outputs="number",
)

demo.launch()