app.py

import gradio as gr

def echo_text(text):
    return text

demo_textbox = gr.Interface(
    fn=echo_text,
    inputs=gr.Textbox(label="Enter some text"), # "text"
    outputs=gr.Textbox(label="Echoed text"), # "text"
    title="Textbox Example"
)

demo_textbox.launch()