Defining the Axis

import matplotlib.pyplot as plt

plt.plot([1,2,3,4], [1,4,9,16], 'r*')

plt.axis([0, 5, 0, 20])

plt.show()

Values for the X axis

are between 0 and 5 and for the

Y axis they are between 0 and 20

[xmin, xmax, ymin, ymax]