'How to get the output of function on_click

I am planning to return the value of gameMode because I would like to use the output of gameMode being easy medium or hard for a game I am doing but there is always a name error. Is there any way to solve this? picture of the error: enter image description here

from ipywidgets import Button, HBox

Modes = ['Easy', 'Medium','Hard']

switch = [Button(description=name) for name in Modes]

combined = HBox([items for items in switch])

def upon_clicked(btn):
    gameMode=btn.description.lower()
    for n in range(len(Modes)):
        switch[n].style.button_color = 'gray'
    btn.style.button_color = 'pink'

for n in range(len(Modes)):
    switch[n].on_click(upon_clicked)

display(combined)
gameMode

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'How to get the output of function on_click

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