Which version to use.
WHAT MATTERS
Python 3 is current. Python 2 is obsolete and unsupported.
WHY THAT MATTERS
Code written for Python 2 does not run on Python 3 without changes.
WHAT ABOUT MINOR VERSIONS
Python 3 releases regularly, each adding features and dropping very old ones.
WHAT TO USE
A recent stable version, not the newest release on the day it appears.
WHY NOT THE NEWEST
Libraries take time to support a new release.
WHAT TO CHECK BEFORE CHOOSING
Which versions your hosting supports Which versions your libraries support
WHAT YOUR HOSTING OFFERS
cPanel's Python application feature offers a set of available versions.
Choose one supported by your dependencies.
WHAT NOT TO DO
Develop on one version and deploy on a very different one.
Differences produce failures that appear only in production.
WHAT TO RECORD
Which version your project requires.
WHERE
In your project documentation and dependency file.
