def __init__(self, cactusHistory):
super(OrderedHistory, self).__init__(cactusHistory.cactus)
self.copy(cactusHistory)
self.eventCosts = cactusHistory.eventCosts
self.ordering = PartialOrderSet(X for X in self.parent)
for event in self.parent:
if self.parent[event] is not None and (
debug.DEBUG or event.ratio > debug.RATIO_CUTOFF):
assert self.ordering.addConstraint(self.parent[event], event)
