[Python-modules-team] Bug#914698: rdepends

[Gordon Ball]

Looking at the rdepends of python{,3}-prompt-toolkit:

rubber
------

Suggests both python- and python3-prompt-toolkit, apparently as a
transitive dependency only if you intend to use pythontex from
texlive-extra-utils.

mycli
-----

Current unstable (1.16) requires ptk 1; upgrading to 1.19 or later
would require ptk 2.

xonsh
-----

Supports both ptk 1 and ptk 2 concurrently.

sagemath
--------

Debian dependency is unversioned, but it appears from upstream source
(https://git.sagemath.org/sage.git/tree/build/pkgs/prompt_toolkit/package-version.txt)
that it currently requires ptk 1

python3-softlayer
-----------------

Current unstable (5.7.2) requires ptk 1; upgrading to 5.8.0 would
require ptk 2.

pgcli
-----

Current unstable (1.9.1) requires ptk 1; upgrading to 2.0 or later would
require ptk 2.

aws-shell
---------

Only supports ptk 1. Bug at https://github.com/awslabs/aws-shell/issues/209,
no movement apparent.

mlbstreamer
-----------

Upstream dependency unversioned. Needs testing.

python3-jupyter-console
-----------------------

Current unstable (5.2) requires ptk 1; upgrading to 6.0 or later (in
git) would require ptk 2.

python3-ipython
---------------

Current unstable (5.8) requires ptk 1; upgrading to 6.0 or later would
require ptk 2.

gitsome
-------

Current unstable (0.8) appears to already require ptk 2 according to
setup.py (but debian dependency is unversioned).


The only python2 dependencies are rubber (suggests only) and ipython
(for which python2 support is going to have to be dropped when upgrading
to a newer version anyway), so the python2 version can probably be
dropped at the same time.