import matplotlib. pyplot as plt import numpy as np from mpl_toolkits.mplot3d import Axes3D

ate a figure and axes
fig = plt.figure()
ax = fig.add_subplot(111)

# create a grid of x and y coordinates
x = np.arange(0, 2*np.pi, 0.01)
y = np.arange(0, 2*np.pi, 0.01)

# create a mesh grid of x and y coordinates
X