how to set font size in matplotlib code example

Example 1: matplotlib plot title font size

from matplotlib import pyplot as plt    

fig = plt.figure()
plt.plot(data)
fig.suptitle('test title', fontsize=20)
plt.xlabel('xlabel', fontsize=18)
plt.ylabel('ylabel', fontsize=16)
fig.savefig('test.jpg')

Example 2: matplotlib change text size

import matplotlib.pyplot as plt
plt.rcParams.update({'font.size': 22})