    def _populate_users(self):
        # type: () -> None
        '''
        Populates the members dictionary mapping user IDs to username, avatar,
        etc.
        '''
        logging.info('Gathering information about all team members...')
        members = self.chat.get_users()
        for member in members:
            user = User(member, self.auth_builder(member['name']), self)
            self.users[member['id']] = user
            self.users_by_name[member['name']] = user
        logging.info('Gathered info on {} users.'.format(len(self.users)))
Populates the members dictionary mapping user IDs to username, avatar,
etc.
securitybot/bot.py