app.py

import gradio as gr
import pandas as pd
import tempfile
import os

def process_csv(file_obj):
    df = pd.read_csv(file_obj)
    df['age'] = df['age'] * 2

    # 一時ファイルを作成して結果を書き込む
    with tempfile.NamedTemporaryFile(delete=False, suffix='.csv', mode='w+') as tmp_file:
        df.to_csv(tmp_file.name, index=False)
        # 一時ファイルのパスを保持
        temp_file_path = tmp_file.name

    # 一時ファイルのパスを返却
    return temp_file_path

iface = gr.Interface(fn=process_csv,
                     inputs=gr.File(label="Upload CSV"),
                     outputs=gr.File(label="Download Processed CSV", type="file"),  # 'type'を'file'に設定
                     description="Upload a CSV with 'name' and 'age' columns. This app will double the 'age' and let you download the processed CSV.")

iface.launch()