#!/usr/bin/env python3
# -*- coding: utf-8 -*-


class Animal(object):
    pass


class Dog(Animal):
    pass


class Husky(Dog):
    pass


a = Animal()
d = Dog()
h = Husky()

print("check a = Animal()...")
print("isinstance(a, Animal) =", isinstance(a, Animal))
print("isinstance(a, Dog) =", isinstance(a, Dog))
print("isinstance(a, Husky) =", isinstance(a, Husky))

print("check d = Dog()...")
print("isinstance(d, Animal) =", isinstance(d, Animal))
print("isinstance(d, Dog) =", isinstance(d, Dog))
print("isinstance(d, Husky) =", isinstance(d, Husky))

print("check h = Husky()...")
print("isinstance(h, Animal) =", isinstance(h, Animal))
print("isinstance(h, Dog) =", isinstance(h, Dog))
print("isinstance(h, Husky) =", isinstance(h, Husky))