How to control stem markers size in matplotlib?

Question

In How to make thicker stem lines in matplolib there is a description of how to control the width of stem lines. But how to control the size of the stem markers?

Answer 1

markerline, stemline, baseline, = ax.stem(x,y,linefmt='k-',markerfmt='ko',basefmt='k.')
plt.setp(stemline, linewidth = 1.25)
plt.setp(markerline, markersize = 5)

While the first two code lines are taken from the link in my question, the third code line changes the marker's size.