Extend the basic Rational Python class outlined above by adding methods to handle shortcut operations. N.B., these, unlike all the others, destructively update the existing rational object. They do not return a new object. The method names are: 

corresponding to operators +=, –=, *=, and /=. Be careful when handling integer arguments and be aware that the updated value may no longer be in lowest terms.

_iadd_, _isub_, _imul_, and _idiv_