Python 3 support (#15530) was completed for Sage 9.0 (thanks in particular to the leadership of Frédéric Chapoton). Official support for Python 2.7 by the CPython core developers is ending January 1, 2020.

To enable major package upgrades and other changes that require Python 3.x (#29141),
this ticket removes Python 2 support in Sage for Sage 9.2.

Depends on #26403
Depends on #28660

CC: @timokau @fchapoton @dimpase

Component: python3

Keywords: days101

Author: Erik Bray

Branch: f368e32

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/28000