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2013-05-20 07:53:08 +0100 asked a question how to make input_box in this code?

I saw the tower of Hanoi from I just only want to make input box in this sage code, but it doesn't work. <- Here I did,

I added

def graph(n=input_box('3', label="Number")):

and spacing all the other lines

What's wrong with this codes?