[Solved]The certificate of ‘bootstrap.pypa.io’ is not trusted when installing pip

You can install it through Homebrew on OS X.

Homebrew is something of a package manager for OS X, more details here:http://mxcl.github.io/homebrew/

If you have Homebrew installed, pip installs with python:

brew install python

Note that this will also install an updated python, default is currently 2.7.5 while brew's python is 2.7.6.