def remove_edge(self,eid):
if not self.has_edge(eid) :
raise InvalidEdge(eid)
sid,tid=self._edges[eid]
self._vertices[sid][1].remove(eid)
self._vertices[tid][0].remove(eid)
del self._edges[eid]
def remove_edge(self, eid):
if not self.has_edge(eid):
raise InvalidEdge(eid)
vs, vt = self._edges[eid]
self._vertices[vs][1].remove(eid)
self._vertices[vt][0].remove(eid)
del self._edges[eid]
self._eid_generator.release_id(eid)
def target(self, eid):
try:
return self._edges[eid][1]
except KeyError:
raise InvalidEdge(eid)
def source(self, eid):
try:
return self._edges[eid][0]
except KeyError:
raise InvalidEdge(eid)
def edge_vertices(self, eid):
try :
return self._edges[eid]
except KeyError :
raise InvalidEdge(eid)