import matplotlib.pyplot as plt

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

images = ['opera.jpg', 'mountain.jpg', '9.jpg']
plt.axis('off')
img = None

for f in images:
   im = plt.imread(f)
   if img is None:
      img = plt.imshow(im)
      plt.pause(0.5)
   else:
      img.set_data(im)
   plt.pause(0.5)
   plt.draw()