app.py

import gradio as gr

def greet(text):
    # This function takes the user input and returns "Hello " + that input
    return "Hello " + text

# Build the Gradio interface
iface = gr.Interface(
    fn=greet,                # the function to run
    inputs=gr.Textbox(       # a textbox for user input
        label="Enter some text"
    ),
    outputs=gr.Textbox(      # a textbox for the output
        label="Greeting"
    ),
    title="Simple Hello App",
    description="Type anything and I'll say hello to it!"
)

if __name__ == "__main__":
    iface.launch()  # launch() starts the web UI