Moving Big Projects to Python 3

Discover strategies for transitioning large-scale Python projects from version 2 to 3 in this EuroPython Conference talk. Learn about the challenges of moving extensive codebases, including dealing with clever tricks, unsupported libraries, and data format issues. Explore the crucial process aspects of migration, such as preparing your codebase, gaining team buy-in, and maintaining Python 2 compatibility. Gain insights on fixing development processes, replacing old libraries, strengthening test suites, and utilizing tools like 2to3. Understand the importance of porting utilities, creating migration scripts, and conducting careful staging tests. Follow a step-by-step approach to successfully move your project to Python 3, including strategies for production deployment and post-migration code cleanup.

Introduction
Moving from Python 2 to Python 3
Porting to Python 3
Preparing vs Planning
Prepare
Add hashes
Test coverage
Unit testing
Upgrade dependencies
Planning
Three questions
Deep magic
How big is your team
Do it in one go
Less time
High risk
Slow steady
Low risk
What you can do
Everyone gets involved
The drawback
Porting
Continuous Integration
Python modernize
Import errors
Fixing errors
Fixing errors book
Scripts
Migration tests
Push to staging
Push to production
Take it slow
Fall back to Python
Clean up
Summary