docs: def insert(self, key, column_parent, column, consistency_level):
      """
      Insert a Column at the given column_parent.column_family and optional column_parent.super_column.
  
      Parameters:
       - key
       - column_parent
       - column
       - consistency_level
      """
      self._seqid += 1
      d = self._reqs[self._seqid] = defer.Deferred()
      self.send_insert(key, column_parent, column, consistency_level)
      return d