matplotlib：更改活动轴

Question

我有多个对象可以可视化不同的事物。它们都被传递到单个 Figure 实例的引用并创建自己的轴对象（同时只有一个处于活动状态）演示代码是：import numpy as npimport matplotlib.pyplot as plt# the visualization objects are jupyter widgets in production code%matplotlib widgetplt.ioff()def update_fig(f):    f.canvas.draw()    f.canvas.flush_events()f = plt.figure()# first visualizer is created and plots into the figureax1 = f.add_subplot(1,1,1, label="visualizer_1")img1 = np.random.randint(0, 256, (20, 20, 3))vis1 = ax1.imshow(img1)update_fig(f)# second visualizer is created and plots into the figureax2 = f.add_subplot(1,1,1, label="visualizer_2")vis2 = ax2.plot(np.linspace(0, 5), 2 * np.linspace(0, 5))update_fig(f)然后如何切换要在图中显示的轴？已经尝试plt.sca(ax1)返回到第一个可视化，但没有奏效。当然，我可以为每个可视化对象使用不同的图形，但由于我有很多，我宁愿避免这种情况。