importar cv2 funciona mas importar cv2.cv como cv não funciona

Eu acho que o caminho sys está correto, cv.pyd e cv.pyd residem em c: \ OpenCV2.3 \ build \ Python \ 2.7 \ Lib \ site-packages.

>>> import sys
>>> sys.path
['', 'C:\\Python27\\Lib\\idlelib', 'C:\\Python27\\lib\\site-packages\\pil-1.1.7-py2.7-win32.egg',     'C:\\Python27\\lib\\site-packages\\cython-0.17-py2.7-win32.egg', 'C:\\Python27\\lib\\site-packages\\pip-1.2-py2.7.egg', 'c:\\OpenCV2.3\\build\\Python\\2.7\\Lib\\site-packages', 'C:\\Python27\\python27.zip', 'C:\\Python27\\DLLs', 'C:\\Python27\\lib', 'C:\\Python27\\lib\\plat-win', 'C:\\Python27\\lib\\lib-tk', 'C:\\Python27', 'C:\\Python27\\lib\\site-packages', 'C:\\Python27\\lib\\site-packages\\IPython\\extensions']

E importar cv ou cv2 parece estar ok mas importar cv2.cv não

>>> import cv
>>> import cv2.cv as cv

Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    import cv2.cv as cv
ImportError: No module named cv
>>> import cv2
>>> cv.NamedWindow("camera", 1)

...

Qual poderia ser o motivo do ImportError?

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