The official documentation on PIP describes an alternative way for installing PIP, which works just perfect with OSX operating system. As the documentation describes, we should download and run the get-pip.py script.

$ curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
$ sudo python get-pip.py

Alternatively you can go ahead and install virtualenv and/or virtualfish for fish shell for better handling of local development environment.