In [4]:

    

class Animal:
    pass


    

In [6]:

    

dog1 = Animal()


    

In [7]:

    

cat1 = Animal()


    

In [8]:

    

isinstance(dog1, Animal)


    

    
Out[8]:





True

In [9]:

    

isinstance(1, Animal)


    

    
Out[9]:





False

In [10]:

    

isinstance(1, int)


    

    
Out[10]:





True

In [11]:

    

class Animal:
    def sleep(self):
        print "I am sleeping"
    def eat(self, food):
        print "I am eating" , food


    

In [12]:

    

dog1 = Animal()


    

In [13]:

    

dog1.sleep()


    

    




I am sleeping

In [14]:

    

dog1.eat("an apple")


    

    




I am eating an apple

In [40]:

    

class Animal:
    def __init__(self, name, weight):
        self.name = name
        self.weight = weight
                
    def sleep(self):
        print self.name, "is sleeping"
    
    def eat(self, food):
        if self.weight < 10 :
            print "I am eating" , food
            self.weight += 1
        else:
            print "no thanks"


    

In [41]:

    

dog1 = Animal("doggy" , 1)


    

In [42]:

    

dog1.name


    

    
Out[42]:





'doggy'

In [43]:

    

dog1.weight


    

    
Out[43]:





1

In [44]:

    

dog1.sleep()


    

    




doggy is sleeping

In [45]:

    

dog1.eat("book")


    

    




I am eating book

In [38]:

    

dog1.weight


    

    
Out[38]:





2

In [46]:

    

cat1 = Animal("kitty" , 1)


    

In [47]:

    

cat1.sleep()


    

    




kitty is sleeping

In [94]:

    

class Animal:
    def __init__(self, name, weight):
        self.name = name
        self.__weight__ = weight
    
    def __add__(self, other):
        return Animal(self.name+"x"+other.name, 
                      self.__weight__+other.__weight__)
    
    def __repr__(self):
        return "My name is "+self.name
    
    def __str__(self):
        return "Animal: "+self.name
    
    def sleep(self):
        print self.name, "is sleeping"
        
    def eat(self, food):
        if self.__weight__ < 10:
            print "I am eating", food
            self.__weight__ += 1
        else:
            print "no thanks"


    

In [95]:

    

dog1 = Animal("doggy" , 1)
cat1 = Animal("kitty" , 1)


    

In [96]:

    

dog1


    

    
Out[96]:





My name is doggy

In [97]:

    

print dog1


    

    




Animal: doggy

In [98]:

    

dog1 + cat1


    

    
Out[98]:





My name is doggyxkitty

In [99]:

    

dog1.eat(cat1)


    

    




I am eating Animal: kitty

In [100]:

    

class Animal:
    def __init__(self, name, weight):
        self.name = name
        self.__weight__ = weight
    
    def __add__(self, other):
        return Animal(self.name+"x"+other.name, 
                      self.__weight__+other.__weight__)
    
    def __repr__(self):
        return "My name is "+self.name
    
    def __str__(self):
        return "Animal: "+self.name
    
    def sleep(self):
        print self.name, "is sleeping"
        
    def eat(self, food):
        if self.__weight__ < 10:
            print "I am eating", food
            self.__weight__ += 1
        else:
            print "no thanks"


    

In [111]:

    

class Bird(Animal):
    def __init__(self, name, weight):
        Animal.__init__(self, name, weight)
        self.name = "!"+self.name+"!"
    def fly(self):
        print "look", self.name, "is flying"
    def __str__(self):
        return "Bird: "+self.name
    
class Fish(Animal):
    def swim(self):
        print "I am swimming"
    def __str__(self):
        return "Fish: "+self.name


    

In [112]:

    

bird1 = Bird("birdy", 1)
fish1 = Fish("fishy", 1)


    

In [113]:

    

bird1 + fish1


    

    
Out[113]:





My name is !birdy!xfishy

In [114]:

    

bird1.eat(fish1)


    

    




I am eating Fish: fishy

In [115]:

    

bird1.fly()


    

    




look !birdy! is flying

In [116]:

    

fish1.swim()


    

    




I am swimming