Answers for "how to add axis title to matplotlib"

set axis title matplotlib

fig.suptitle('test title', fontsize=20)
plt.xlabel('xlabel', fontsize=18)
plt.ylabel('ylabel', fontsize=16)

matplotlib title inside plot

import matplotlib. pyplot as plt
A= [2,1,4,5]; B = [3,2,-2,1]
plt.scatter(A,B)
plt.title("title", x=0.9, y=0.9)
plt.xlabel("x-axis")
plt.ylabel("y-axis")
plt.show()