app.py

import gradio as gr

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

with gr.Blocks() as demo:
    name = gr.Textbox("text")
    output = gr.Textbox("text")
    greet_button = gr.Button("Greet")
    greet_button.click(greet, name, outputs=output, api_name="greet")

demo.launch()