JupyterLab:如何将python回调函数附加到使用Custom Widget创建的按钮？

from ipywidgets import Button
from traitlets import observe

class CustomButton(Button):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

class CustomButton(Button):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        
    @observe('clicks')
    def on_button_click(self, change):
        # 在这里编写回调函数的逻辑
        print("按钮被点击了！")

button = CustomButton(description='点击我')
display(button)