planning.py

class AngelicNode(Node):
    """
    Extends the class Node.
    self.action:     contains the optimistic description of an angelic HLA
    self.action_pes: contains the pessimistic description of an angelic HLA
    """

    def __init__(self, state, parent=None, action_opt=None, action_pes=None, path_cost=0):
        super().__init__(state, parent, action_opt, path_cost)
        self.action_pes = action_pes