Fix Python – How to add title to subplots in Matplotlib

I have one figure which contains many subplots.
fig = plt.figure(num=None, figsize=(26, 12), dpi=80, facecolor=’w’, edgecolor=’k’)
fig.canvas.set_window_title(‘Window Title’)

# Returns the Axes instance
ax = fig.add_subplot(311)
ax2 = fig.add_subplot(312)
ax3 = fig.add_subplot(313)

How do I add titles to the subplots?
fig.suptitle adds a titl….