app.py

import gradio as gr

def greet(name):
    return f"Hello {name}!"

demo = gr.Interface(fn=greet, inputs="text", outputs="text")


def create_app():
    with gr.Blocks() as demo:
        gr.Markdown("## Simple Greeting App")
        name = gr.Textbox(label="Enter your name")
        output = gr.Textbox(label="Greeting")
        btn = gr.Button("Greet")
        btn.click(greet, inputs=name, outputs=output)
    return demo

demo = create_app()