usern_name_tester

 def user_mention(self, status):

        # Once again we create an empty array
        results = []

        # Here we want to check the user mentions component of the status
        # So the first step is to identify if it's empty or not
        if status.entities['user_mentions']:
            
            # Multiple users can be mentioned in a tweet,
            # so we'll want to build a for-loop 
            
            for user in status.entities['user_mentions']:

                # We lower our results like we lowered our input to compare them
                # For our case, we're pulling out the value of screen_name, this is
                # based on the assumption that you're tracking the screen names of the user's.
                # Alternatively you could use their id, but you'd need to set up a process to get 
                # the ids first.

                results.append(str(user['screen_name']).lower() in self.twitter_accounts)
        else:
            pass

        # We want to return if there's any that true in our array
        return any(results)