Before you can start experimenting with Ansible, you must install it first. There was no need in duplicating all the great documentation to accomplish this already created on http://docs.ansible.com/. I would encourage you to go to the following URL and choose an install method of your choice: http://docs.ansible.com/ansible/intro_installation.html.
Tip
If you are installing Ansible on Mac OS, I found using Homebrew was much simpler and consistent. More details on using Homebrew can be found at http://brew.sh.
The command to install Ansible with Homebrew is brew install ansible.
It is very important to note that in order to use the new features part of Ansible version 2.0, you must update the version running on your OSA deployment node. The version currently running on the deployment node is either 1.9.4 or 1.9.5. The method that seemed to work well every time is outlined here. This part is a bit experimental, so please make a note of any warnings...