Get a group Resource from the server.

        :param id: ID of the group to get
        :param id: str
        :param expand: Extra information to fetch inside each resource
        :type expand: Optional[Any]

        :rtype: User

def group(self, id, expand=None):
        """Get a group Resource from the server.

        :param id: ID of the group to get
        :param id: str
        :param expand: Extra information to fetch inside each resource
        :type expand: Optional[Any]

        :rtype: User
        """
        group = Group(self._options, self._session)
        params = {}
        if expand is not None:
            params['expand'] = expand
        group.find(id, params=params)
        return group