Driver code
if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT root = None NEW_LINE root = AddNode ( root , 2 ) NEW_LINE root = AddNode ( root , 6 ) NEW_LINE root = AddNode ( root , 5 ) NEW_LINE root = AddNode ( root , 3 ) NEW_LINE root = AddNode ( root , 4 ) NEW_LINE root = AddNode ( root , 1 ) NEW_LINE root = AddNode ( root , 7 ) NEW_LINE sum = 8 NEW_LINE TargetPair ( root , sum ) NEW_LINE DEDENT