Selenium Webdriver Python Install Mac Sierra 10.12
This is Short Guide Shows You How-to Install the Python Selenium Webdriver and Chromedriver for Python Client on Mac 10.12 Sierra OS X.
And Selenium for Mac Sierra is a set of different software tools each with a different approach to supporting test automation.
Finally also included instructions about Chromedriver SetUp on Mac and Getting-Started with Selenium Webdriver on Chrome Browser with Python.

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Open a Shell Terminal emulator window
Finder > Applications > Utilities > Terminal
(Press “Enter” to Execute Commands) - Check if Python Setuptools are Installed on your Mac
which easy_install
If Not then Follow the Guide here Below
How-to Install Required Python Setuptools on Mac OS X -
Install Selenium Webdriver
sudo pip install selenium
If Got “User is Not in Sudoers file” then Look: Solution
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Set-Up the Chromedriver
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Quick-Start Guide Selenium Webdriver & Chromedriver on Python:
Webdriver+Chromedriver Quick-Start on Python