def __init__(self, data=None, **kwds):
DiGraph.__init__(self, **kwds)
if data is not None:
try: # build a rooted tree
D = DiGraph()
for (child, parent) in data.par.iteritems():
D.add_edge(parent, child)
except AttributeError:
D = DiGraph(data)
except: # else nothing we can do
raise NetworkXError, "Data %s is not a rooted tree:" % data
if D.order() == D.size() + 1:
self.pred = D.pred.copy()
self.succ = D.succ.copy()
self.adj = self.succ
del D
else: # not a tree
raise NetworkXError, "Data %s is not a rooted tree:" % data
def __init__(self,data=None,**kwds):
DiGraph.__init__(self,**kwds)
if data is not None:
try: # build a rooted tree
D=DiGraph()
for (child,parent) in data.par.iteritems():
D.add_edge(parent,child)
except AttributeError:
D=DiGraph(data)
except: # else nothing we can do
raise NetworkXError, "Data %s is not a rooted tree:"%data
if D.order()==D.size()+1:
self.pred=D.pred.copy()
self.succ=D.succ.copy()
self.adj=self.succ
del D
else: # not a tree
raise NetworkXError, "Data %s is not a rooted tree:"%data
