python programming return self name this is another accessor method that uses the birthday information to return string representing the date def birthdate(self)return str(self month"/str(self day"/str(self year this is mutator method that changes the speaktext of the dog object def changebark(self,bark)self speaktext bark operator overloading python provides operator overloadingwhich is nice feature of programming languages because it makes it possible for the programmer to interact with objects in very natural way operator overloading is already implemented for variety of the built-in classes or types in python for instanceintegers ( the int typeunderstand how they can be added together to form new integer object addition is implemented by special method in python called the __add__ method when two integers are added togetherthis method is called to create new integer object if you look in the appendicesyou'll see examples of these special methods and how they are called for examplein chap the __add__ method is called by writing where is an integer the methods that begin and end with two underscores are methods that python associates with corresponding operator when we say that python supports operator overloading we mean that if you define method for your class with name that is operator overloadedyour class will support that operator as well python figures out which method to call based on the types of the operands involved for instancewriting calls the int class __add__ method when is an integerbut it calls the float type' __add__ method when is float this is because in the case of the __add__ methodthe object on the left hand side of the operator corresponds to the object on the left hand side of the dot ( the periodin the equivalent method call __add__(ythe object on the left side of the dot determines which add method is called the operator is overloaded if we wanted to define addition for our dog classwe would include an __add__ method in the class definition it might be natural to write boydog girldog to create new puppy object if we wished to do that we would extend our dog class as shown in sect the dog class with overloaded addition class dogthis is the constructor for the class it is called whenever dog object is created the reference called "selfis created by python and made to point to the space for the newly created object python does this automatically for us but we have to have "selfas the first parameter to the __init__ method ( the constructorthis copy belongs to 'acha