python - pyplot 3D bar legend

Question

I'm trying to add legend to a 3d bar, but with no success.

I'm getting the error:

AttributeError: 'Patch3D' object has no attribute '_facecolor2d'

A minimal code for reproducing: from mpl_toolkits.mplot3d import Axes3D import matplotlib.pyplot as plt import numpy as np

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
for z in [10, 0]:
    xs = np.arange(20)
    ys = np.random.rand(20)
    ax.bar(xs, ys, zs=z, zdir='y', label=str(z))
ax.legend()
plt.show()

How Can I add a legend to a 3d bar?