Note: Python 2.7.9 and later and Python 3.4 and later include pip by default so you do not have to install it.
If you have a new machine you probably want to update your distribution packages.
Install using get-pip.py
This method works on all Operating Systems..
curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py" && python get-pip.py
Install pip on Ubuntu
sudo apt-get update && sudo apt-get upgrade sudo apt-get -y install python-pip
Install pip on CentOS
Lets install pip using yum.
rpm -iUvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm yum -y update yum -y install python-pip
Install pip on Mac (OS X)
pip is available on OS X via easy_install
sudo easy_install pip
In case you do not have python on your mac, you can use brew to install and pip will come bundled with it.
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install python
Install pip on Windows
The best method to install pip on windows is via get-pip.py which is mentioned above.
You should see something like this. pip 8.1.2 from /Library/Python/2.7/site-packages (python 2.7)
Incase these steps do not work for you, do mention them in the comments below or tweet me on twitter and I would be eager to help you.