#pet.py

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

    def __repr__(self):
        return self.name+' '+str(self.age)


p1 = Pet('bob',12)
p2 = Pet('alice',7)

print(p1)


class Dog(Pet):
    def __init__(self,name,age,bark):
        super().__init__(name,age)
        self.bark = bark

    def __repr__(self):
        return super().__repr__() + ' ' + self.bark

    
        

d1 = Dog('carol',14, 'ruff')
print(d1)

print(isinstance(d1,Dog))
print(isinstance(d1,Pet))
print(issubclass(Dog,Pet))