How to define a single main title above all subspaces with Pyplot?

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I am using pyplot. I have 4 subplots. How to set a single, main title above all the subplots? title() sets it above the last subplot.


Use plt.suptitle:

import matplotlib.pyplot as plt
import numpy as np

fig=plt.figure()
data=np.arange(900).reshape((30,30))
for i in range(1,5):
    ax=fig.add_subplot(2,2,i)
    ax.imshow(data)

plt.suptitle('Main title')
plt.show()

yields