在virtualenv中使用Python 3.3编写IPython笔记本

I have my Ubuntu 12.04 system set up so that I can create a virtualenv with either Python 2.7 or Python 3.3, and run IPython Notebook. The problem is, I don't know exactly what I did to my system to make this possible. I am trying to help someone else get their system set up the same way, and I'm not sure what packages I am missing.I have my Ubuntu 12.04 system set up so that I