title: how to run pip for python 3 and python 2
body: <p>I have two versions of python installed on my machine (Ubuntu 14.xx LTE) as well as two versions of <code>pip</code> (one for python 2 and one for python 3). When I run <code>pip --version</code> on the command line I get the following output: <code>pip 1.5.4 from /usr/lib/python2.7/dist-packages (python 2.7)</code>. I looked into this directory and it has many other things in it. However I couldn't find <code>pip.py</code> in it. How do I run <code>pip</code> for python 3? Any help is appreciated.</p>