[Python-modules-team] Bug#979110: python3-ipykernel: DeprecationWarning so should declare dependency on python3-ipyparallel

[Julian Gilbey]

Package: python3-ipykernel
Version: 5.4.2-1
Severity: normal

I am seeing warnings like the following from python3-ipykernel:

/usr/lib/python3/dist-packages/ipykernel/zmqshell.py:57
  /usr/lib/python3/dist-packages/ipykernel/zmqshell.py:57: DeprecationWarning: ipykernel.datapub is deprecated. It has moved to ipyparallel.datapub
    from ipykernel.datapub import ZMQDataPublisher

/usr/lib/python3/dist-packages/ipykernel/datapub.py:21
  /usr/lib/python3/dist-packages/ipykernel/datapub.py:21: DeprecationWarning: ipykernel.serialize is deprecated. It has moved to ipyparallel.serialize
    from ipykernel.serialize import serialize_object

/usr/lib/python3/dist-packages/ipykernel/serialize.py:25
  /usr/lib/python3/dist-packages/ipykernel/serialize.py:25: DeprecationWarning: ipykernel.pickleutil is deprecated. It has moved to ipyparallel.
    from ipykernel.pickleutil import (

/usr/lib/python3/dist-packages/ipykernel/pickleutil.py:26
  /usr/lib/python3/dist-packages/ipykernel/pickleutil.py:26: DeprecationWarning: ipykernel.codeutil is deprecated since IPykernel 4.3.1. It has moved to ipyparallel.serialize
    from ipykernel import codeutil

Looking at the code for ipykernel, it is attempting to load these
functions from ipyparallel and only falling back on the ipykernel
versions if ipyparallel is not available or is version < 5.0.0.  So
this package should Depends: python3-ipyparallel.

Best wishes,

   Julian

-- System Information:
Debian Release: bullseye/sid
  APT prefers stretch
  APT policy: (500, 'stretch'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.9.0-5-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-ipykernel depends on:
ii  python3                 3.9.0-4
ii  python3-ipython         7.19.0-1
ii  python3-jupyter-client  6.1.6-1
ii  python3-tornado         6.1.0-1+b1
ii  python3-traitlets       5.0.5-1

python3-ipykernel recommends no packages.

python3-ipykernel suggests no packages.

-- no debconf information