isympy crashes on start, missing a dependency on python-sympy

[Luke Faraone]

$ sudo apt install isympy
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gstreamer0.10-gconf gstreamer0.10-plugins-good gstreamer0.10-pulseaudio
  gstreamer0.10-x
Use 'sudo apt autoremove' to remove them.
The following NEW packages will be installed
  isympy
0 to upgrade, 1 to newly install, 0 to remove and 2 not to upgrade.
Need to get 82.5 kB of archives.
After this operation, 227 kB of additional disk space will be used.
Get:1 http://ftp.uni-kassel.de/ubuntu/ubuntu xenial/universe amd64 isympy all 0.7.6.1-1 [82.5 kB]
Fetched 82.5 kB in 0s (187 kB/s)
Selecting previously unselected package isympy.
(Reading database ... 238292 files and directories currently installed.)
Preparing to unpack .../isympy_0.7.6.1-1_all.deb ...
Unpacking isympy (0.7.6.1-1) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up isympy (0.7.6.1-1) ...

$ isympy
Traceback (most recent call last):
  File "/usr/bin/isympy", line 357, in <module>
    main()
  File "/usr/bin/isympy", line 353, in main
    from sympy.interactive import init_session
ImportError: No module named sympy.interactive

Workaround:

Install python-sympy

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: isympy 0.7.6.1-1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Jul 22 14:28:34 2016
InstallationDate: Installed on 2016-07-16 (6 days ago)
InstallationMedia: Ubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160217.1)
PackageArchitecture: all
SourcePackage: sympy
UpgradeStatus: Upgraded to xenial on 2016-07-21 (0 days ago)

[Luke Faraone (lfaraone)]

This is separate from bug #1535760, which is about Python 3 support.

And, ah, a slightly different issue than Debian bug #827740 since the package in wily/xenial/yakkety doesn't depend on python{,3}-sympy at all.

[Launchpad Janitor (janitor)]

This bug was fixed in the package sympy - 1.0-1ubuntu1

---------------
sympy (1.0-1ubuntu1) yakkety; urgency=medium

  * Drop isympy's alternative dependency on 3.x libs, as it (as currently
    written) limited to Python 2.x. LP: #1605615
  * Depend on python3-mpmath, fixes FTBFS. Closes: #830365

 -- Luke Faraone <email address hidden> Fri, 22 Jul 2016 13:54:16 +0000