Installing psycopg2 for PostGreSQL as django backend using virtualenv

Hello django people,

I'm just installing my PostgreSQL backend for my django projects that I install in isolated virtualenv's

I've followed what seem like easy installation instructions here:

http://initd.org/psycopg/install/

I have installed python-dev,   libpq-dev and also postgresql-server-dev-9.1

I workon my virtualenv and use its pip installation to install psycopg2:

(env) $ sudo pip install psycopg2

It appears to install successfully:

Successfully installed psycopg2

but when I use yolk to list my virtualenv packages or look in my site-packages for my virtualenv or try to import psycopg2 I find that it is not installed in the virtualenv like I thought it would be.

I found I do have a psycopg2 installed in my system wide python installation and I'm not sure if my attempt to install it locally actually installed it globally or if the global installation was there to begin with from some set up installation I did using someone else's code ( that I don't pretend to understand )

Two questions:

1) why didn't it install like I expected?

2) do I want psycopg2 insalled in my local virtualenv's python installation for django? or should it be in my global python installation? 

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