Plot a plane and points in 3D simultaneously

Just to add to @suever’s answer, you there’s no reason why you can’t create the Axes and then plot both the surface and the scatter points on it. Then there’s no need to use ax.hold():

# Create the figure
fig = plt.figure()

# Add an axes
ax = fig.add_subplot(111,projection='3d')

# plot the surface
ax.plot_surface(xx, yy, z, alpha=0.2)

# and plot the point 
ax.scatter(point2[0] , point2[1] , point2[2],  color="green")