Retrieve a "base user"'s list, and store it in :attr:`._base_scores`.

        :param str base_user: Base users' username

def init(self, base_user):
        """
        Retrieve a "base user"'s list, and store it in :attr:`._base_scores`.

        :param str base_user: Base users' username
        """
        self._base_user = base_user

        # Modify this for multiple services support when the time comes
        base_list = endpoints.myanimelist(base_user)

        for anime in base_list:
            id = anime["id"]
            score = anime["score"]

            self._base_scores[id] = [score]

        return self