Driver code
if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT head = None ; NEW_LINE head = push ( head , 5 ) NEW_LINE head = push ( head , 7 ) NEW_LINE head = push ( head , 5 ) NEW_LINE head = push ( head , 1 ) NEW_LINE head = push ( head , 7 ) NEW_LINE print ( countNode ( head ) ) NEW_LINE DEDENT