<div id="comment:0"></div> some pep8 details, mainly CC: @tscrim @kwankyu @kliem @slel Component: **categories** Author: **Frédéric Chapoton** Branch/Commit: **[`0de22b1`](https://github.com/sagemath/sagetrac-mirror/commit/0de22b101de7f9a790e8cb043350760624c1a936)** Reviewer: **Travis Scrimshaw** _Issue created by migration from https://trac.sagemath.org/ticket/34638_