[Debian-astro-maintainers] Bug#968781: python3-sunpy: Breaks python3-asdf

[Yannick Roehlly]

Package: python3-sunpy
Version: 2.0.1-2
Severity: important

Hi,

Having python3-sunpy installed breaks the use of python3-asdf.  For instance,
using the example from the asdf documentation:

%<---
import asdf
import numpy as np

# Create some data
sequence = np.arange(100)
squares  = sequence**2
random = np.random.random(100)

# Store the data in an arbitrarily nested dictionary
tree = {
    'foo': 42,
    'name': 'Monty',
    'sequence': sequence,
    'powers': { 'squares' : squares },
    'random': random
}

# Create the ASDF file object from our data tree
af = asdf.AsdfFile(tree)
%<---

fails with:

DistributionNotFound: The 'parfive[ftp]>=1.1.0' distribution was not found and
is required by the application

This happens because asdf parses the 'asdf_extensions' entry points and try to
load them. 'sunpy.io.special.asdf.extension:SunpyExtension' is the sunpy
extension that raises the issue when calling load.

At first, I thought that it could be an asdf bug because parfive[ftp] could be
an optional dependency of sunpy but apparently it is in the install_requires 
of
the module[1].

Note that the python3-parfive package in Debian does not contain the ftp 
module.
When it is installed, the error raised is:

UnknownExtra: parfive 1.1.1 has no such extra feature 'ftp'

Regards,

Yannick

[1] https://github.com/sunpy/sunpy/blob/master/setup.cfg#L41


-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.8.2 (SMP w/12 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, 
TAINT_UNSIGNED_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), 
LANGUAGE=fr:en_GB
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-sunpy depends on:
ii  libc6                               2.31-3
ii  python3                             3.8.2-3
ii  python3-astropy                     4.1~rc1-2
ii  python3-matplotlib                  3.3.0-3
ii  python3-numpy [python3-numpy-abi9]  1:1.19.1-1
ii  python3-pandas                      1.0.4+dfsg-1
ii  python3-scipy                       1.5.2-2

Versions of packages python3-sunpy recommends:
ii  python3-bs4         4.9.1-1
ii  python3-drms        0.5.7-1
ii  python3-requests    2.23.0+dfsg-2
ii  python3-skimage     0.17.2-2
ii  python3-sqlalchemy  1.3.18+ds1-1
ii  python3-suds        0.8.4-1

python3-sunpy suggests no packages.

-- no debconf information

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