Design a simplified version of Twitter, where users can post tweets, follow/unfollow others, and is able to see the 10 most recent tweets in the user’s news feed.

twitter_sample.py

class User:
    
    def __init__(self, user_name):
        self.user_name = user_name
        self.tweets = []
        self.follows = []
    
    def __str__(self):
        return self.user_name
  
    @property
    def user_name(self):
        return self._user_name
  
    @user_name.setter
    def user_name(self, name):
        if not isinstance(name, str):
            raise TypeError('Expected a string.')
        self._user_name = name
  
    def post_tweet(self, tweet):
        self.tweets.insert(0, tweet)
    
    def follow_user(self, user):
        self.follows.append(user)
        print(f'Now you’re following {user}.')
    
    def unfollow_user(self, user):
        if user not in self.follows:
            print(f'You don’t follow {user}.')
        self.follows.remove(user)
        print(f'You unfollow {user}.')
    
    def get_news_feed(self):
        if not self.tweets:
            print('This user hasn’t tweeted anything yet.')
        # Returns ten or less tweets.
        return self.tweets[:10]

    
def main():
    # Creates two users.
    user_01 = User('William')
    print(f'User {user_01} created.')
    user_02 = User('Iago')
    print(f'User {user_02} created.')

    # Post some tweets with both users.
    user_01.post_tweet('This is my first tweet!')
    user_01.post_tweet('This is my second tweet!')
    user_02.post_tweet('This is my first tweet ever!')
    user_02.post_tweet('This is my second tweet ever!')
    
    # One follows the other and one unfollows the other.
    user_01.follow_user(user_02)
    user_02.follow_user(user_01)
    user_01.unfollow_user(user_02)
    user_02.unfollow_user(user_01)                    
    
    # Ten (or less) most recent tweets in both user's news feed.
    print(f'\nMost recent tweets in {user_01}’s news feed:')
    for tweet in user_01.get_news_feed():
        print(tweet)

    print(f'\nMost recent tweets in {user_02}’s news feed:')
    for tweet in user_02.get_news_feed():
      print(tweet)


if __name__ == '__main__':
    main()