def move_version(self, id, after=None, position=None):
        """Move a version within a project's ordered version list and return a new version Resource for it.

        One, but not both, of ``after`` and ``position`` must be specified.

        :param id: ID of the version to move
        :param after: the self attribute of a version to place the specified version after (that is, higher in the list)
        :param position: the absolute position to move this version to: must be one of ``First``, ``Last``,
            ``Earlier``, or ``Later``
        """
        data = {}
        if after is not None:
            data['after'] = after
        elif position is not None:
            data['position'] = position

        url = self._get_url('version/' + id + '/move')
        r = self._session.post(
            url, data=json.dumps(data))

        version = Version(self._options, self._session, raw=json_loads(r))
        return version
Move a version within a project's ordered version list and return a new version Resource for it.

        One, but not both, of ``after`` and ``position`` must be specified.

        :param id: ID of the version to move
        :param after: the self attribute of a version to place the specified version after (that is, higher in the list)
        :param position: the absolute position to move this version to: must be one of ``First``, ``Last``,
            ``Earlier``, or ``Later``