The fix is to ignore deprecation warnings about collections.abc. This already done in src/sage/all.py. At some point, this should be fixed throughout the Sage library, but that's for another ticket.

Component: python3

Author: John Palmieri

Branch/Commit: 8712a2f

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/28002