>>> """
============================================================================
Demonstrates plotting contour (level) curves in 3D using the extend3d option
============================================================================

This modification of the contour3d_demo example uses extend3d=True to
extend the curves vertically into 'ribbons'.
"""
... 
... from mpl_toolkits.mplot3d import axes3d
... import matplotlib.pyplot as plt
... from matplotlib import cm
... 
... ax = plt.figure().add_subplot(projection='3d')
... X, Y, Z = axes3d.get_test_data(0.05)
... ax.contour(X, Y, Z, extend3d=True, cmap=cm.coolwarm)
... 
... plt.show()
...