150 

   150 

   151 

   151 

   152 # use networkX instead ?

   152 # use networkX instead ?

   153 # http://networkx.lanl.gov/reference/algorithms.traversal.html#module-networkx.algorithms.traversal.astar

   153 # http://networkx.lanl.gov/reference/algorithms.traversal.html#module-networkx.algorithms.traversal.astar

   154 def transitive_closure_of(entity, relname, _seen=None):

   154 def transitive_closure_of(entity, relname, _seen=None):

   155     if _seen is None:

   158     if _seen is None:

   156         _seen = set()

   159         _seen = set()

   157     _seen.add(entity.eid)

   160     _seen.add(entity.eid)

   158     yield entity

   161     yield entity

   159     for child in getattr(entity, relname):

   162     for child in getattr(entity, relname):