Driver code
if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT head = None NEW_LINE head = insert ( head , 9 ) NEW_LINE head = insert ( head , 8 ) NEW_LINE head = insert ( head , 6 ) NEW_LINE head = insert ( head , 5 ) NEW_LINE head = insert ( head , 4 ) NEW_LINE head = insert ( head , 2 ) NEW_LINE head = insert ( head , 1 ) NEW_LINE x = 7 NEW_LINE pairSum ( head , x ) NEW_LINE DEDENT