import gradio as gr

def calculate(operation, a, b):
    if operation == 'Add':
        return a + b
    elif operation == 'Subtract':
        return a - b
    elif operation == 'Multiply':
        return a * b
    elif operation == 'Divide':
        return a / b if b != 0 else 'Error: Division by zero'

interface = gr.Interface(
    fn=calculate,
    inputs=[
        gr.Dropdown(choices=['Add', 'Subtract', 'Multiply', 'Divide'], label="Operation"),
        gr.Number(label="First Number"),
        gr.Number(label="Second Number")
    ],
    outputs="text"
)


interface.launch()