app.py

#!/usr/bin/env python

import gradio as gr
import pandas as pd


def fn(df: pd.DataFrame) -> str:
    return "a"


df_orig = pd.DataFrame(data={"a": [1, 2, 3]})

with gr.Blocks() as demo:
    df = gr.Dataframe(value=df_orig, type="pandas", interactive=False)
    btn = gr.Button()
    text = gr.Textbox()

    btn.click(fn=fn, inputs=df, outputs=text)

if __name__ == "__main__":
    demo.queue().launch()