Question

I am working in Eclipse on Mac. I am using PyDev version 2.6.0.2012062818. I have a program that was running perfectly, but after I updated my Lion OS to Mountain Lion OS I have the following error while running:

Traceback (most recent call last):
  File "/Users/Mihails/Projects/memsim/src/memsim/memsim.py", line 7, in <module>
     from simulation import SimulationHP
  File "/Users/Mihails/Projects/memsim/src/memsim/simulation.py", line 9, in <module>
     import matplotlib.pyplot as plt
   File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/pyplot.py", line 95, in <module>
     new_figure_manager, draw_if_interactive, _show = pylab_setup()
   File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup
     globals(),locals(),[backend_name])
   File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/backends/backend_wxagg.py", line 23, in <module>
     import backend_wx    # already uses wxversion.ensureMinimal('2.8')
   File "/Library/Frameworks/Python.framework/Versions/7.3/lib/python2.7/site-packages/matplotlib/backends/backend_wx.py", line 63, in <module>
     backend_version = wx.VERSION_STRING
AttributeError: 'module' object has no attribute 'VERSION_STRING'

I don’t understand wx module at all. I don’t have wx folder in site-packages. I have wxPython. wxPython init.py file :

# The "old" wxPython package

import warnings

warnings.warn(
    "The wxPython compatibility package is no longer automatically generated "
    "or actively maintained.  Please switch to the wx package as soon as possible.",
    DeprecationWarning, stacklevel=2)

# We need to be able to import from the wx package, but there is also
# a wxPython.wx module and that would normally be chosen first by
# import statements.  So instead we'll have a wxPython._wx module and
# then stuff it into sys.modules with a wxPython.wx alias so old
# programs will still work.

import _wx
import sys
sys.modules['wxPython.wx'] = _wx
wx = _wx
del sys

from wx import __version__

Answer 1

I think when you update, some files have been replaced.

On Ubuntu 11.04 wx.VERSION_STRING, return string value.

Try reinstall WX, or append the ‘VERSION_STRING’, to WX main file.