Greg Price - Clearer Code at Scale: Static Types at Zulip and Dropbox - PyCon 2018

From a channel Lumen includes in full: The official PyCon US 2018 recordings: full talks and multi-hour tutorials by Python core developers and practitioners on the language, testing, packaging, data science and web development, selected by the conference's community review.

A 30-minute video from PyCon 2018's catalogue; the title names its topic.

Video by PyCon 2018, played through YouTube's embedded player.