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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_parent_ids(self):
 """Gets the parents of this node. return: (osid.id.IdList) - the parents of this node *compliance: mandatory -- This method must be implemented.* """

        id_list = []
        from ..id.objects import IdList
        for parent_node in self._my_map['parentNodes']:
            id_list.append(str(parent_node.ident))
        return IdList(id_list)