Tkinter 函数中的全局变量

如何解决Tkinter 函数中的全局变量

我希望能够访问 difficulty 函数内的 startingRegion 和 validateStart()。我该怎么做呢？我正在使用 tkinter

def startgame():
    root = Tk()

    #storing user choice under variable difficulty
    difficulty = StringVar(value="Easy")
    difdropdown = OptionMenu(root,difficulty,"Easy","Hard")

    regions = []
  
    startingRegion = StringVar()
    startingRegion.set(regions[0])
    difdropdown = OptionMenu(root,startingRegion,*regions)
    
    def validateStart():
        global root
        print(startingRegion)
        print(difficulty)
        root.destroy()
    
    #button which when clicked goes to validateStart()
    playGameButton = Button(command = validateStart)