Preparing for the great snakes migration by Heather Williams

A Lightning Talk at PyCon ZA 2020

1. Great snakes migration Upgrading from python 2 to python 3 By Heather Williams
2. The Problem • A large codebase • Around 3 000 python files used to generate questions on a website • Monolith disguised as microservices
3. Solution: Walled gardens • Make the monolith a true monolith • Identify the real microservices • Docker all the things • Walled garden around the python files for questions
4. Solution: automate it Python 2to3 is a great tool https://docs.python.org/3.0/library/2to3.html
5. Solution: requirements files • Remove unnecessary dependencies • Upgrade out of date dependencies • Note what needs python 3 to upgrade
6. Great snakes migration Take the plunge and do it!