kcsanjeeb

class You(object):
    def __init__(self):
        print("You :: How can i arrange such a huge software product launch event all by myself. What a mess.")
    def askEventOrganizer(self):
        print("You :: I think i should contact an event organizer\n")
        eo = EventOrganizer()
        eo.arrange()
    def __del__(self):
        print("you :: Thanks to the event organizer, all preparations are successfully completed.")

kcsanjeeb

class Hotelier(object):
    def __init__(self):
        print("--- Hotel Arrangement ---")
    def __isAvailable(self):
        print("Is the hotel available to oraganize launch event on the date ?")
        return True
    def bookHotel(self):
        if self.__isAvailable():
            print("Registered the Booking\n")

kcsanjeeb

class EventOrganizer(object):
    def __init__(self):
        print("I will manage the event for you. I will talk to the service providers.\n")
    def arrange(self):
        self.hotelier = Hotelier()
        self.hotelier.bookHotel()
        
        self.florist = Florist()
        self.florist.setFlowerRequirements()

kcsanjeeb

class EventOrganizer(object):
    def __init__(self):
        print("I will manage the event for you. I will talk to the service providers.\n")
    def arrange(self):
        self.hotelier = Hotelier()
        self.hotelier.bookHotel()
        
        self.florist = Florist()
        self.florist.setFlowerRequirements()

kcsanjeeb

class EventOrganizer(object):
    def __init__(self):
        print("I will manage the event for you. I will talk to the service providers.\n")
    def arrange(self):
        self.hotelier = Hotelier()
        self.hotelier.bookHotel()
        
        self.florist = Florist()
        self.florist.setFlowerRequirements()

kcsanjeeb

import sqlite3
class MetaSingleton(type):
    _instances ={}
    def __call__(cls, *args, **kwargs):
        if cls not in cls._instances:
            cls._instances[cls] = super(MetaSingleton, cls).__call__(*args, **kwargs)
        return cls._instances[cls]

class Database(metaclass=MetaSingleton):

kcsanjeeb

class ClassA(type):
    def __call__(cls,*args,**kwds):
        print("This is my integers : ",args)
        return type.__call__(cls,*args,**kwds)
class int(metaclass=ClassA):
    def __init__(self,x,y):
        self.x = x 
        self.y = y

test = int(20,40)

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):

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

from abc import ABCMeta, abstractmethod

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