<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_range_slices(self, column_parent, predicate, range, consistency_level):
 """ returns a subset of columns for a contiguous range of keys. Parameters: - column_parent - predicate - range - consistency_level """

    self._seqid += 1
    d = self._reqs[self._seqid] = defer.Deferred()
    self.send_get_range_slices(column_parent, predicate, range, consistency_level)
    return d