如何在Matplotlib 3d Ploting中更改边框的颜色？

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

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

# 这里以绘制一个立方体为例
x = [1, 1, -1, -1, 1, 1, -1, -1]
y = [1, -1, -1, 1, 1, -1, -1, 1]
z = [1, 1, 1, 1, -1, -1, -1, -1]
ax.plot(x, y, z)

# 使用setp()函数设置边框的颜色
ax.setp(ax.spines.values(), color='red')

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

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

x = [1, 1, -1, -1, 1, 1, -1, -1]
y = [1, -1, -1, 1, 1, -1, -1, 1]
z = [1, 1, 1, 1, -1, -1, -1, -1]
ax.plot(x, y, z)

ax.setp(ax.spines.values(), color='red')

plt.show()