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# SQLite database

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': 'mydatabase',
    }
}

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#MYSql Database

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': config('DB_NAME'),
        'USER': config('DB_USER'),
        'PASSWORD': config('DB_PASSWORD'),
        'HOST': '127.0.0.1',
        'PORT': '3306',

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python -m pip freeze > requirements.txt

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python -m pip install -r requirements.txt

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python3 -m venv env
source env/bin/activate

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import React, {  useState, useEffect ,useRef } from 'react';
import {
  SafeAreaView,
  ScrollView,
  StyleSheet,
  View,
  ImageBackground,
  Image,
  Animated,
  Dimensions,

kcsanjeeb

if __name__ =='__main__':
    blog_publisher = BlogPublisher()
    
    for Subscribers in [SMSSubscriber,EmailSubscriber,AnyOtherSubscriber]:
        Subscribers(blog_publisher)
    print("\n Subscribers : ",blog_publisher.subscribers())

    blog_publisher.addBlog('My First Blog!')
    blog_publisher.notifySubscribers()

kcsanjeeb

class SMSSubscriber:
    def __init__(self,publisher):
        self.publisher=publisher
        self.publisher.attach(self)

    def update(self):
        print(type(self).__name__,self.publisher.getBlog())

class EmailSubscriber:
     def __init__(self,publisher):

kcsanjeeb

from abc import ABCMeta, abstractmethod

class Subscriber(metaclass=ABCMeta):
    @abstractmethod
    def update(self):
        pass

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class BlogPublisher:
    def __init__(self):
        self.__subscribers=[]
        self.__latestBlog = None
    def attach(self,subscriber):
        self.__subscribers.append(subscriber)
    def detach(self):
        return self.__subscribers.pop()
    def subscribers(self):
        return [type(x).__name__ for x in self.__subscribers]