该pyplot.scatter()功能是出于以下原因而量身定制的：
import matplotlib.pyplot as plt
im = plt.imread(image_name)
implot = plt.imshow(im)
# put a blue dot at (10, 20)
plt.scatter([10], [20])
# put a red dot, size 40, at 2 locations:
plt.scatter(x=[30, 40], y=[50, 60], c='r', s=40)
plt.show()
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