[Bug 752647] Re: "import pylab" in a python console flags error "No module named _tkagg"

[Julian Taylor]

** Bug watch added: Debian Bug tracker #621700
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621700

** Also affects: matplotlib (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621700
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/752647

Title:
  "import pylab" in a python console flags error "No module named
  _tkagg"

Status in “matplotlib” package in Ubuntu:
  Confirmed
Status in “matplotlib” package in Debian:
  Unknown

Bug description:
  I upgraded from Maverick to Natty Beta 1 yesterday evening. Upon
  firing up a python console and issuing "import pylab" I get the
  following error:

  manjul at chaar:~$ python
  Python 2.7.1+ (r271:86832, Mar 24 2011, 00:39:14) 
  [GCC 4.5.2] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import pylab
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/pymodules/python2.7/pylab.py", line 1, in <module>
      from matplotlib.pylab import *
    File "/usr/lib/pymodules/python2.7/matplotlib/pylab.py", line 247, in <module>
      from matplotlib.pyplot import *
    File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 78, in <module>
      new_figure_manager, draw_if_interactive, show = pylab_setup()
    File "/usr/lib/pymodules/python2.7/matplotlib/backends/__init__.py", line 25, in pylab_setup
      globals(),locals(),[backend_name])
    File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 8, in <module>
      import tkagg                 # Paint image to Tk photo blitter extension
    File "/usr/lib/pymodules/python2.7/matplotlib/backends/tkagg.py", line 1, in <module>
      import _tkagg
  ImportError: No module named _tkagg
  >>> 

  The module was fully functional before the upgrade. All python
  packages have been installed from the repos and there has been no
  customization so far.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: python-matplotlib 0.99.3-1ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.40-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  NonfreeKernelModules: wl
  Architecture: i386
  Date: Wed Apr  6 11:45:56 2011
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  ProcEnviron:
   LANGUAGE=en_US:en
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: matplotlib
  UpgradeStatus: Upgraded to natty on 2011-04-06 (0 days ago)