Download this file: get-pip.py
Then simply type
sudo python get-pip.py
Make sure you are on the same directory as get-pip.py or you supply the correct path for that file.
For details, you can visit: http://pip.readthedocs.org/en/latest/installing.html
or, http://thegauraw-blog-blog.tumblr.com/post/47601704154/how-to-install-pip-in-both-windows-ubuntu-easiest-way
