Filled Contours

import numpy as np

import matplotlib.pyplot as plt

xlist = np.linspace(-3.0, 3.0, 100)

ylist = np.linspace(-3.0, 3.0, 100)

X, Y = np.meshgrid(xlist, ylist)

Z = np.sqrt(X**2 + Y**2)

plt.figure()

cp = plt.contourf(X, Y, Z)

plt.colorbar(cp)

plt.title('Filled Contours Plot')

plt.xlabel('x (cm)')

plt.ylabel('y (cm)')

plt.show()