PyCon 2019 | API Evolution the Right Way

Speaker: A. Jesse Jiryu Davis


If you maintain a library, how can you innovate without breaking the projects that depend on it? Follow semantic versioning, add APIs conservatively, add parameters compatibly, use DeprecationWarnings and publish a deprecation policy, guide your users on how to upgrade, and make wise choices about when to break backwards compatibility.

Slides can be found at: and

Previous Cloud Computing In A Nutshell
Next PyCon 2019 | A Guide To Software Engineering For Visually Impaired