Class_dog.py

class Dog:
    # This is the constructor for the class. It is called whenever a Dog
    # object is created. The reference called "self" is 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 "self" as the first
    # parameter to the __init__ method (i.e. the constructor). 
    def __init__(self, name, month, day, year, speakText):
        self.name = name
        self.month = month
        self.day = day
        self.year = year
        self.speakText = speakText
        
    # This is an accessor method that returns the speakText stored in the
    # object. Notice that "self" is a parameter. Every method has "self" as its
    # first parameter. The "self" parameter is a reference to the current 
    # object. The current object appears on the left hand side of the dot (i.e.
    # the .) when the method is called. 
    def speak(self):
        return self.speakText
    
    # Here is an accessor method to get the name
    def getName(self):
        return self.name
    
    # This is another accessor method that uses the birthday information to 
    # return a string representing the date.
    def birthDate(self):
        return str(self.month) + "/" + str(self.day) + "/" + str(self.year)
    
    # This is a mutator method that changes the speakText of the Dog object.
    def changeBark(self,bark):
        self.speakText = bark
        
    # When creating the new puppy we don't know it's birthday. Pick the 
    # first dog's birthday plus one year. The speakText will be the 
    # concatenation of both dog's text. The dog on the left side of the + 
    # operator is the object referenced by the "self" parameter. The 
    # "otherDog" parameter is the dog on the right side of the + operator. 
    def __add__(self,otherDog):
        return Dog("Puppy of " + self.name + " and " + otherDog.name, \
                   self.month, self.day, self.year + 1, \
                   self.speakText + otherDog.speakText)
  
def main():      
    boyDog = Dog("Mesa", 5, 15, 2004, "WOOOOF")
    girlDog = Dog("Sequoia", 5, 6, 2004, "barkbark")
    print(boyDog.speak())
    print(girlDog.speak())
    print(boyDog.birthDate())
    print(girlDog.birthDate())
    boyDog.changeBark("woofywoofy")
    print(boyDog.speak())
    puppy = boyDog + girlDog
    print(puppy.speak())
    print(puppy.getName())
    print(puppy.birthDate())
    print(str(puppy.name))
    print(repr(puppy.name))
    
if __name__ == "__main__":
    main()