问无法在ubuntu上升级redis-py包

EN

 (testme)ubuntu@msg:~$ sudo pip install redis==2.10.3
Downloading/unpacking redis==2.10.3
  Downloading redis-2.10.3.tar.gz (86Kb): 86Kb downloaded
  Running setup.py egg_info for package redis

    warning: no previously-included files found matching '__pycache__'
    warning: no previously-included files matching '*.pyc' found under directory 'tests'
Installing collected packages: redis
  Found existing installation: redis 2.9.1
    Uninstalling redis:
      Successfully uninstalled redis
  Running setup.py install for redis

    warning: no previously-included files found matching '__pycache__'
    warning: no previously-included files matching '*.pyc' found under directory 'tests'
Successfully installed redis
Cleaning up...

(testme)ubuntu@msg:~$ pip freeze | grep redis
(testme)ubuntu@msg:~$ 

(testme)ubuntu@msg:~$ python
Python 2.7.3 (default, Feb 27 2014, 19:58:35) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import redis
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named redis
>>>