Installing MatPlotLib on OS X for Python Version 2.6.1 with PIP and VirtualEnv  
  
    If you thought you had installed matplotlib only to find this
File "/Library/Python/2.6/site-packages/matplotlib-0.91.1-py2.6-macosx-10.6-universal.egg/matplotlib/numerix/__init__.py", line 166, in 
    __import__('ma', g, l)
  File "/Library/Python/2.6/...  
  
    
      Written by Sean Behan on 06/17/2012