(Python 3.4)

8.17 Implement your own string class myStr that behaves like the regular str class except that:

The addition (+) operator returns the sum of the lengths of the two strings (instead of the concatenation). The multiplication (*) operator returns the product of the lengths of the two strings. The two operands, for both operators, are assumed to be strings; the behavior of your implementation can be undened if the second operand is not a string.

>>> x = myStr( ' hello ' )>>> x + ' universe '

13 >>> x * ' universe '

40