def __init__(self, operator, name=None):
        """
        Construct a node.
        :param name: The name of the relation.
        :param operator: The operator used to create this relation. One of
        the node.Operator enum.
        """
        self.operator = operator
        self.name = name
        self.attributes = None
def __init__ ( self , operator , name = None ) : self . operator = operator self . name = name self . attributes = None
Construct a node.
        :param name: The name of the relation.
        :param operator: The operator used to create this relation. One of
        the node.Operator enum.