用pypt函数，建立一个窗口，有两个按钮 一个按钮按下，会打印一个“1” 另一个按钮按下，会打印一个‘2’

import tkinter
import tkinter.messagebox

def print_1():
    print('1')

def print_2():
    print('2')

top = tkinter.Tk()
mb = tkinter.Menubutton(top, text = 'choose', relief = 'raised')
mb.grid()
mb.menu = tkinter.Menu(mb, tearoff = 0)
mb['menu'] = mb.menu
aVar = tkinter.IntVar()
bVar = tkinter.IntVar()
mb.menu.add_checkbutton(label = 'Print 1', variable = aVar, \
                        onvalue = 1, offvalue = 0, command = print_1)
mb.menu.add_checkbutton(label = 'Print 2', variable = bVar, \
                        onvalue = 1, offvalue = 0, command = print_2)
mb.pack()
top.mainloop()