Enthought Python Distribution (EPD) free version -- www.enthought.com
Version: 7.3-2 (32-bit)
(type 'upgrade' or see www.enthought.com/epd/upgrade to get the full EPD)

Python 2.7.3 |EPD_free 7.3-2 (32-bit)| (default, Apr 11 2012, 18:02:54)
[GCC 4.1.2 20080704 (Red Hat 4.1.2-44)] on linux2
Type "credits", "demo" or "enthought" for more information.
>>> import pylab
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/matplotlib/pylab.py", line 264, in <module>
    from matplotlib.pyplot import *
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/matplotlib/pyplot.py", line 95, in <module>
    new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup
    globals(),locals(),[backend_name])
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/matplotlib/backends/backend_wxagg.py", line 23, in <module>
    import backend_wx    # already uses wxversion.ensureMinimal('2.8')
  File "/home/john/.virtualenvs/epd/lib/python2.7/site-packages/matplotlib/backends/backend_wx.py", line 65, in <module>
    raise ImportError(missingwx)
ImportError: Matplotlib backend_wx and backend_wxagg require wxPython >=2.8
>>>