app.py

import gradio as gr

def greet(name):
    return "Hello " + name + "!"

with gr.Blocks() as demo:
    name = gr.Textbox(label = "Please enter the name below")
    output = gr.Textbox(label = "Output Box")
    greet_button = gr.Button("Greet")
    greet_button.click(fn = greet,
                    inputs = name,
                    outputs = output)

demo.launch()