[Python-modules-team] Bug#841726: ipython3: importing something from ipython has side effects

[Dominik George]

Package: ipython3
Version: 2.4.1-1
Severity: critical
Justification: breaks unrelated software

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Importing ipython in any other Python script has side effects.  This is
sometimes done, e.g.  in situations where a script wants to list all
packages installed on a system, like so:

  import pkgutil
  for i in pkgutil.walk_packages(onerror=lambda x: None):
    pass

Python imports all packages discovered by that once, and simply importing
something must not have any side effects.

However, Python drops into an IPython shell afterwards and also behaves
oddly in other ways.

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

Kernel: Linux 4.7.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/lksh
Init: systemd (via /run/systemd/system)

Versions of packages ipython3 depends on:
ii  python3-decorator      4.0.6-1
ii  python3-pkg-resources  28.0.0-1
ii  python3-simplegeneric  0.8.1-1
pn  python3:any            <none>

ipython3 recommends no packages.

Versions of packages ipython3 suggests:
pn  ipython3-notebook   <none>
pn  ipython3-qtconsole  <none>
pn  python3-zmq         <none>

- -- no debconf information

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