点击按钮改变标签内容（采用lambda函数方式）

from Tkinter import*window=Tk()counter=IntVar()counter.set(0)def click(variable,value):    variable.set(variable.get()+value)frame=Frame(window)frame.pack()button1=Button(frame,text='UP',command=lambda:click(counter,1))button1.pack()button2=Button(frame,text='DOWN',command=lambda:click(counter,-1))button2.pack()label=Label(frame,textvariable=counter)label.pack()window.mainloop()