cannot import IDENTITY


I've installed the latest matplotlib (27 september) and when I try to do :

from matplotlib.matlab import *

I get this :

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.3/site-packages/matplotlib/", line 160,
in ?
    from axes import Axes
  File "/usr/lib/python2.3/site-packages/matplotlib/", line 9, in ?
    from artist import Artist
  File "/usr/lib/python2.3/site-packages/matplotlib/", line 4, in
    from transforms import identity_transform
  File "/usr/lib/python2.3/site-packages/matplotlib/", line
182, in ?
    from _transforms import IDENTITY, LOG10, Func, FuncXY, PolarXY
ImportError: cannot import name IDENTITY