def add_v_graph(self):
    (graph, label) = self.get_v_graph_and_label()
    self.play(ShowCreation(graph))
    self.play(Write(label))
    self.graph = graph
    self.graph_label = label
def add_v_graph(self):
    (graph, label) = self.get_v_graph_and_label()
    self.play(ShowCreation(graph))
    self.play(Write(label))
    self.graph = graph
    self.graph_label = label