app.py

import gradio as gr

def pri(df):
    print(len(df))


with gr.Blocks() as demo:
    df = gr.Dataframe(
        type="array"
        headers=["name"],
        datatype=["str"],
        row_count=(4, "fixed"),
        col_count=(1, "fixed"))
    btn = gr.Button()
    btn.click(pri, df)

demo.launch()