[Python-modules-team] Bug#887101: ipython upgrade status

[Gordon Ball]

To update on the current situation:

 * I have uploaded forked python 2 source packages of ipython, ipykernel
   and prompt_toolkit in order to allow ipython2 to be kept for the time
   being while unblocking the upgrade path for ipython3. These are
   currently waiting in NEW.
 * I have uploaded python-backcall (new dependency for ipython >= 6),
   also waiting in NEW.
 * I have started a transition for prompt_toolkit (version 2 required for
   ipython >= 7), given that this is an API-breaking change and there
   are other blockers.

Once packages have cleared NEW, ipython3 will be updated, Depending
whether the prompt_toolkit transition takes longer, there might be an
intermediate upload of ipython 6.x until it is possible to upload 7.x.