text: """
  =================================================
  Animated image using a precomputed list of images
  =================================================
  """
  # https://github.com/matplotlib/matplotlib/blob/master/examples/animation/dynamic_image.py
  import numpy as np
  import matplotlib.pyplot as plt
  import matplotlib.animation as animation
  
  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)
  # ims is a list of lists, each row is a list of artists to draw in the
  # current frame; here we are just animating one artist, the image, in
  # each frame
  ims = []
  for i in range(60):
      x += np.pi / 15.
      y += np.pi / 20.
      im = plt.imshow(f(x, y), animated=True)
      ims.append([im])
  
  ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True,
                                  repeat_delay=1000)
  
  # To save the animation, use e.g.
  #
  # ani.save("movie.mp4")
  #
  # or
  #
  # writer = animation.FFMpegWriter(
  #     fps=15, metadata=dict(artist='Me'), bitrate=1800)
  # ani.save("movie.mp4", writer=writer)
  
  plt.show()