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from mpl_toolkits.mplot3d import Axes3D

import matplotlib.pyplot as plt

import numpy as np

from matplotlib import cm

fig = plt.figure()

ax = fig.add_subplot(111, projection='3d')

u = np.linspace(-1, 1, 100)

x, y = np.meshgrid(u, u)

z = x ** 2 + y ** 2

ax.plot_surface(x, y, z, cmap=cm.YlGnBu_r)

plt.show()