<div id="comment:0"></div> This fixes all doctest errors with python3 in `src/sage/manifolds`. CC: @fchapoton @tscrim Component: **geometry** Author: **Eric Gourgoulhon** Branch: **[`46bae3b`](https://github.com/sagemath/sagetrac-mirror/commit/46bae3b27ee10a2686af8985a4c245606924c5c4)** Reviewer: **Frédéric Chapoton** _Issue created by migration from https://trac.sagemath.org/ticket/26475_