How to plot additional points on the top of scatter plot?

If you need points overlaid on the original plot, use

ax.plot(x, y)

ex.

ax = plt.subplot(1, 1, 1)
ax.scatter([1, 2, 3], [1, 2, 3])
ax.plot(1.5, 1.5, "or")

enter image description here

if you pass a list to x and y, multiple points can be added to the plot. Also in case you need to add some annotation beside the point, try

ax.annotate("Some explanation", x, y)

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