小编nuk*_*0ne的帖子

change_label当全局变量a改变其值时如何调用函数？我试图change_variable模拟变量的实际变化（单击按钮时变量会发生变化）。

from tkinter import *

a = 3

class Application(Frame):

    def __init__(self, master):
        Frame.__init__(self, master)
        self.master = master
        self.button = Button(self.master, text='Change Variable', command=self.change_variable)
        self.button.grid(row=0)
        self.label = Label(self.master, text='Test')
        self.label.grid(row=1)

    def change_label(self):
        self.label.config(bg='Red', fg='Yellow')

    def change_variable(self):
        global a
        a = 1

def main():
    root = Tk()
    Application(root)
    root.mainloop()

if __name__ == '__main__':
    main()