如何在Jupyter笔记本中暂停此代码?

当我单击提交答案按钮时,其他代码只能在之后运行。

import ipywidgets as widgets

下面是几行代码,它们负责按钮的外观等。

selector = widgets.RadioButtons(
    options=['Valid', 'Invalid', 'Skip'], 
    value=None,
    description='',
    disabled=False
)
button = widgets.Button(
    description='Submit answer',
    disabled=False,
    button_style='',
)
    
def evaluate(button):
    selection = selector.get_interact_value()    
    if (selection == 'Valid'):
        f = open(r"C:\Users\asd\Desktop\asd.txt", "a", encoding='utf-8')
        f.write('asd')
        f.close()
    elif (selection == 'Invalid'):
        pass
    elif (selection == 'Skip'):
        pass

button.on_click(evaluate)        

left_box = widgets.VBox([selector, button])
widgets.HBox([left_box])

print('nvm') **#If I click Submit answer button, then run this code**

我该怎么做?