I have one figure with multiple subplots, and each subplot has the same number of lines (In my case it's 4 lines). How can I have one single legend (say, ['a', 'b', 'c', 'd'] ) on the side for all the subplots?
BTW, I plotted the subplot axes using
fig, ax_list = plt.subplots(rows, cols)
and then for each subplot
ax_list[0][0].plot()