[Tkinter-discuss] why tkinter do not quit?

[守株待兔]

here is my program:
from Tkinter import *
def helloButton():
    print 'hello button'
    root.quit
root = Tk()
Button(root,text = 'Hello Button',command = helloButton).pack()
root.mainloop()

when i click on my  button,print is ok,why  root.quit have no effect?
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