如何使用ipywidget按钮下载文件？

import ipywidgets as widgets
from IPython.display import display
from IPython.display import FileLink

button = widgets.Button(description="下载文件")
output = widgets.Output()

def on_button_clicked(b):
    with output:
        # 下载文件的逻辑处理
        # 例如，可以使用requests库从URL下载文件
        import requests
        url = "https://example.com/file.txt"
        response = requests.get(url)
        with open("file.txt", "wb") as file:
            file.write(response.content)
        # 显示下载链接
        display(FileLink("file.txt"))

# 将按钮点击事件与处理函数关联
button.on_click(on_button_clicked)

display(button, output)