how to put title to each plot in subplots code example

Example 1: matplotlib subplots title

fig.suptitle('This is a somewhat long figure title', fontsize=16)

Example 2: title subplot

import matplolib.pyplot as plt
for i in range(4):
    plt.subplot(2,2,i+1).set_title('Subplot n°{}' .format(i+1))
plt.show()