title: How to switch Python versions in Terminal?
body: <p>My Mac came with Python 2.7 installed by default, but I'd like to use Python 3.6.1 instead.</p>
  
  <p>How can I change the Python version used in Terminal (on Mac OS)?</p>
  
  <p>Please explain clearly and <em>offer no third party version manager suggestions</em>.</p>