I have both python2.7 and python3.2 installed in Ubuntu 12.04. The symbolic link python links to python2.7
python2.7
python3.2
Ubuntu 12.04
python
Well, on ubuntu 13.10/14.04, things are a little different.
$ sudo apt-get install python3-pip
$ sudo pip3 install packagename
NOT pip-3.3 install
pip-3.3 install