kcsanjeeb

class Chocolate:
    
    def __init__(self):
        self.__maxprice = 290

    def sell(self):
        print("Selling Price:{}".format(self.__maxprice))

    def setMaxPrice(self, price):
        self.__maxprice = price

kcsanjeeb

class Sparrow:
    def flight(self):
        print("Sparrow can fly")
    def swim(self):
        print("Sparrow can't swim")
class Penguin:
    def flight(self):
        print("Penguin can't fly")   
    def swim(self):
        print("Penguin can swim")

kcsanjeeb

class B:
    class A:
        def a1(self):
            print("a1")
    class B(A):
        def b(self):
            print("b")
    
    b = B()
    b.a1()

kcsanjeeb

class Adder:
    def __init__(self):
        self.sum = 0 
    def add(self,value):
        self.sum += value

acc = Adder()
for i in range(99):
    acc.add(i)
print(acc.sum)

kcsanjeeb

class A(object):
    def a1(self):
        print("a1")
class B(object):
    def b(self):
        print("b")
        A().a1()

objectB =B()
objectB.b()

kcsanjeeb

from abc import ABCMeta, abstractmethod

class Section(metaclass=ABCMeta):
    @abstractmethod
    def describe(self):
        pass

class PersonalInfoSection(Section):
    def describe(self):
        print("Personal information section")

kcsanjeeb

from abc import ABCMeta, abstractmethod

class Employee(metaclass=ABCMeta):
    @abstractmethod
    def create(self):
        pass

class manager(Person):
    def create(self, name):

kcsanjeeb

from abc import ABCMeta, abstractmethod

class PizzaFactory(metaclass=ABCMeta):
    @abstractmethod
    def createVegPizza(self):
        pass
    @abstractmethod
    def createNonVegPizza(self):
        pass

kcsanjeeb

class Singleton(object):
    def __new__(cls):
        if not hasattr(cls, 'instance'):
            cls.instance = super(Singleton,cls).__new__(cls)
        return cls.instance
    
s = Singleton()
print("Object created",s)

sA = Singleton()

kcsanjeeb

class Singleton:
    __instance = None 
    def __init__(self):
        if not Singleton.__instance:
            print("__init__ method is called.")
        else:
            print("Instance is already created :",self.getInstance())
    
    @classmethod
    def getInstance(cls):