ImportError: cannot import name urandom

I use Ubuntu11.10 and python2.7.2+ .

File "/usr/lib/python2.7/random.py", line 47, in <module>
    from os import urandom as _urandom
ImportError: cannot import name urandom

After I checked os.py , I found that there is no module named "urandom" in it:

$ python
Python 2.7.2+ (default, Aug 16 2011, 07:24:41)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.urandom
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'urandom'

So I reinstall python2.7.2 :

https://launchpad.net/ubuntu/+source/python2.7/2.7.2-13ubuntu5

$ ./configure

$ make

$ sudo make install

then it fixed the error!

Reference: https://bugs.launchpad.net/ubuntu/+source/python2.7/+bug/954595