# Animal
# base class
class Animal:

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def  preview(self):
        print(f"{self.name} is a {self.creature} of {self.age} years old")



# Dog
# extends Animal
class Dog(Animal):

    voice = 'woof! ~@_@~'

    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.creature = 'dog'

    def speak(self):
        print(self.voice)



# Cat
# extends Animal
class Cat(Animal):

    voice = 'meao!! >^_^<'

    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.creature = 'cat'

    def speak(self):
        print(self.voice)


# functions
# --- -- -- - - -

def newLine():
    print(" ")

def attrs(obj):
    for attribute, value in obj.__dict__.items():
        print(f"{attribute}: {value}")


# instances
# --- -- -- - - -

d = Dog('Ersi', 8)
r = Cat('Riri', 10)

d.preview()
d.speak()
attrs(d)

newLine()

r.preview()
r.speak()
attrs(r)