error

[Anish Chapagain]

from Tkinter import *
root=Tk()
f=Frame(root,height=200,width=200)
b=Button(f,text="quit",command=f.quit)
f.pack()
root.mainloop()

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from Tkinter import *
import sys
root=Tk()
f=Frame(root,height=200,width=200)
b=Button(f,text="quit",command=sys.exit)
f.pack()
root.mainloop()

I am wondering that why the button after clikcing is not closing the
window..please any suggestion..
i tries command=f.quit, sys.quit also..
if there is something i'm missing please help