app.py

import gradio as gr
import pandas as pd

def upload_file(fp):
    return pd.read_csv(fp).head()

with gr.Blocks() as demo:
    file_input = gr.File(label="Upload CSV", type="filepath")
    df_output  = gr.DataFrame(label="Preview")
    file_input.change(upload_file, inputs=[file_input], outputs=[df_output])
demo.launch(debug=True)