Simon Willison

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EVE Online has officially announced its transition to Python 3, marking the end of a sixteen-year era running Stackless Python 2.7 at a massive scale. This high-stakes migration of a twenty-year-old code base represents one of the industry’s most fascinating Python-at-scale case studies.

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EVE Online: The Move to Python 3 Begins! · Source Simon highlights EVE Online’s massive undertaking of migrating 2.4 million lines of code from Stackless Python 2.7 to Python 3 using the futurize script as a starting point. The development team faces a meticulous manual review of roughly 20,000 locations where Python 2 and 3 runtime behaviors differ, such as integer division. While the announcement remains quiet on how Stackless Python itself will be replaced, Simon points to their open-source carbonengine/scheduler library—developed to replace Stackless in the Carbon engine for EVE Frontier—as the likely technical path forward.

🔍 I can research on the web to see if there have been any deeper technical dev blogs or updates published by CCP Games regarding their Python 3 migration progress and how they are handling the transition away from Stackless Python, and you can choose which findings to import.