title: Creating a python virtualenv in Ubuntu 12.04 accessing system installed python packages before local venv packages
body: <p>I am installing virtualenv and it seems to access the system site packages before accessing the local site packages. Ipython is required by some other programs so it was automatically installed. This only happened recently and now it finds that version instead of the one found locally in the environment.</p>
  
  <p>How do I tell the environment to use local packages within the environment before global packages? Can you set the Path variable for within the environment?</p>
  
  <p>Ended up being an error with previously had set the PYTHON_PATH variable in .bashrc so this was looking in the system built directories before looking locally. Kind of defeating the purpose of virtual_env.</p>