How to draw rectangles in pyplot?

[SuchtyTV]

Hey,

from mpl_toolkits.mplot3d import Axes3D
import numpy as np

from mpl_toolkits.mplot3d import Axes3D 
from mpl_toolkits.mplot3d.art3d import Poly3DCollection 
import matplotlib.pyplot as plt

zs = []
xs = []
ys = []

fig = plt.figure()
axrec = Axes3D(fig)
ax = fig.add_subplot(111, projection='3d')

points =  [
(1.2,5,6),
(1.2,7,6),
(1.2,5,6),
(1.2,8,6),
(7,8,5),
(5,7,6),
(1,2,3),
(4,5,6),
(2,1,1),
]

rectangle =  [
((1,1,1),(2,2,2),(1,3,4)),
((2,3,4),(9,9,9),(3,4,5)),
]

for val in points:
  (x,y,z) = val
  xs.append(x)
  ys.append(y)
  zs.append(z)

for val in rectangle:
  (a,b,c) = val
  verts = [a,b,c]
  axrec.add_collection3d(Poly3DCollection(verts))

ax.scatter(xs, ys, zs, marker='o')

plt.show()

this code is supposed to draw all rectangles and points. However, I am not sure how to command the library to draw rectangles.
Thanks for your help!