title: wxPython import error
body: <p>I'm having trouble figuring out an error message in Python.</p>
  
  <p>yesterday, I've installed python using the latest EPD package, and wxPython2.9 using the wxPython2.9-osx-cocoa-py2.7 package for Mac OS.
  I then added wx to my PYTHONPATH.</p>
  
  <pre><code>export WXDIR=/usr/local/lib/wxPython-2.9.1.1/lib/python2.7/site-packages/wx-2.9.1-osx_cocoa
  export PYTHONPATH=$WXDIR
  export PYTHONPATH=$PYTHONPATH:$WXDIR/tools
  </code></pre>
  
  <p>but when I try to run stuff I get this error:</p>
  
  <pre><code>In [14]: import matplotlib.pyplot
  ---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  
  /Users/imrisofer/Documents/third/hddm-read-only/hddm/&lt;ipython console&gt; in &lt;module&gt;()
  
  /Library/Frameworks/EPD64.framework/Versions/7.0/lib/python2.7/site-packages/matplotlib/pyplot.py in &lt;module&gt;()
       93 
       94 from matplotlib.backends import pylab_setup
  ---&gt; 95 new_figure_manager, draw_if_interactive, show = pylab_setup()
       96 
       97 @docstring.copy_dedent(Artist.findobj)
  
  /Library/Frameworks/EPD64.framework/Versions/7.0/lib/python2.7/site-packages/matplotlib/backends/__init__.py in pylab_setup()
       23         backend_name = 'matplotlib.backends.%s'%backend_name.lower()
       24     backend_mod = __import__(backend_name,
  ---&gt; 25                              globals(),locals(),[backend_name])
       26 
       27     # Things we pull in from all backends
  
  
  /Library/Frameworks/EPD64.framework/Versions/7.0/lib/python2.7/site-packages/matplotlib/backends/backend_wxagg.py in &lt;module&gt;()
       21 
       22 from backend_agg import FigureCanvasAgg
  ---&gt; 23 import backend_wx    # already uses wxversion.ensureMinimal('2.8')
       24 from backend_wx import FigureManager, FigureManagerWx, FigureCanvasWx, \
       25     FigureFrameWx, DEBUG_MSG, NavigationToolbar2Wx, error_msg_wx, \
  
  /Library/Frameworks/EPD64.framework/Versions/7.0/lib/python2.7/site-packages/matplotlib/backends/backend_wx.py in &lt;module&gt;()
       43         import wxversion
       44     except ImportError:
  ---&gt; 45         raise ImportError(missingwx)
       46 
       47     # Some early versions of wxversion lack AlreadyImportedError.
  
  
  ImportError: Matplotlib backend_wx and backend_wxagg require wxPython &gt;=2.8
  </code></pre>
  
  <p>I can successfully import wx, so I don't no what's the problem.
  Am I missing anything in the PYTHONPATH?</p>