tl;dr: EVE Online is finally migrating its 2.4 million lines of Python 2.7 code (running on Stackless Python since 2003) to Python 3, aiming for performance gains, better tooling, and modern library support. An initial scan found 95.9% of files already compile under both versions, with only ~3,300 blocking lines, but roughly 20,000 lines compile fine yet behave differently (e.g., integer division) and require manual review. Stage 1 changes have been deployed to Tranquility and should be invisible to players; the harder line-by-line work is still ahead.