def exist_edge(self, graph, orig, dest, idx, branch, turn, tick, extant):
        """Declare whether or not this edge exists."""
        if (branch, turn, tick) in self._btts:
            raise TimeError
        self._btts.add((branch, turn, tick))
        graph, orig, dest = map(self.pack, (graph, orig, dest))
        self._edges2set.append((graph, orig, dest, idx, branch, turn, tick, extant))
def exist_edge ( self , graph , orig , dest , idx , branch , turn , tick , extant ) : if ( branch , turn , tick ) in self . _btts : raise TimeError self . _btts . add ( ( branch , turn , tick ) ) graph , orig , dest = map ( self . pack , ( graph , orig , dest ) ) self . _edges2set . append ( ( graph , orig , dest , idx , branch , turn , tick , extant ) )
Declare whether or not this edge exists.