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()