def restore_edge(self, edge):
        """
        Restores a previously hidden edge back into the graph.
        """
        try:
            head_id, tail_id, data = self.hidden_edges[edge]
            self.nodes[tail_id][0].append(edge)
            self.nodes[head_id][1].append(edge)
            self.edges[edge] = head_id, tail_id, data
            del self.hidden_edges[edge]
        except KeyError:
            raise GraphError('Invalid edge %s' % edge)
def restore_edge ( self , edge ) : try : head_id , tail_id , data = self . hidden_edges [ edge ] self . nodes [ tail_id ] [ 0 ] . append ( edge ) self . nodes [ head_id ] [ 1 ] . append ( edge ) self . edges [ edge ] = head_id , tail_id , data del self . hidden_edges [ edge ] except KeyError : raise GraphError ( 'Invalid edge %s' % edge )
Restores a previously hidden edge back into the graph.