如何等到matplotlib动画结束？

请考虑直接从Matplotlib文档中获取的以下代码:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
import time # optional for testing only
import cv2 # optional for testing only

fig = plt.figure()   

def f(x, y):
    return np.sin(x) + np.cos(y)

x = np.linspace(0, 2 * np.pi, 120)
y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)

im = plt.imshow(f(x, y), animated=True)    

def updatefig(*args):
    global x, y
    x += np.pi / 15.
    y += np.pi / 20.
    im.set_array(f(x, y))
    return im,

ani = animation.FuncAnimation(fig, updatefig, interval=50, blit=True)
plt.show()

这在我的系统上工作正常.现在,尝试将以下代码附加到上面的代码中:

while True: 
  #I have tried any of these 3 commands, without success:  
    pass
    #time.sleep(1)
    #cv2.waitKey(10)

结果是该程序冻结了.显然,Matplotlib的"Animation"类在一个单独的线程中运行动画.所以我有以下两个问题:

1)如果进程在一个单独的线程中运行,为什么它会受到后续循环的干扰？

2)如何对python说等到动画结束？