psutil module not fully working on debian 7
Question: I'm trying to get the amount of free memory in the system using python. basically the same info that i can get from `cat /proc/meminfo | grep MemFree`.
    
    
    >>> import psutil
    >>> psutil.NUM_CPUS # this works fine
    2
    >>> psutil.virtual_memory() # this fails
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: 'module' object has no attribute 'virtual_memory'
    

i'm using python 2.7.3

**update**

    
    
    >>> psutil.__version__
    '0.5.0'
    


Answer: 
    Python 2.7.5+ (default, Sep 19 2013, 13:48:49) 
    [GCC 4.8.1] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import psutil
    >>> psutil.NUM_CPUS # this works fine
    4
    >>> psutil.virtual_memory() # this fails
    vmem(total=4042084352L, available=1697619968L, percent=58.0, used=3149373440L, free=892710912L, active=2016649216, inactive=835248128, buffers=55672832L, cached=749236224)
    >>> quit()
    ~$ cat /proc/meminfo | grep MemFree
    MemFree:          876836 kB
    ~$ python -c "print 892710912/1024"
    871788
    ~$ python -c "import psutil;print psutil.__version__"
    1.1.3
    

Possibly you need to run:

    
    
    sudo pip install psutil --upgrade
    

Note that you will never get exactly the same answers as you are running
python in one case and not in the other.

