Lessons learned from five years of maintaining one of the most-used Python libraries. I’ve published dozens of open source projects over the years, mostly in Python and JavaScript. Few are old and stable, others are new and immature, some are wildly popular with a constant stream of contributors, but most linger until one day a trickle of users suddenly discover them. This is a guide on how to traverse these waters and foster your project into something you can be proud of.