old_contents: # Nessus results viewing tools
  #
  # Developed by Felix Ingram, f.ingram@gmail.com, @lllamaboy
  # http://www.github.com/nccgroup/nessusviewer
  #
  # Released under AGPL. See LICENSE for more information
  
  if __name__ == '__main__':
      import wx
      from controller import ViewerController
      app = wx.App(0)
      ViewerController()
      app.MainLoop()
  
new_contents: # Nessus results viewing tools
  #
  # Developed by Felix Ingram, f.ingram@gmail.com, @lllamaboy
  # http://www.github.com/nccgroup/nessusviewer
  #
  # Released under AGPL. See LICENSE for more information
  
  if __name__ == '__main__':
      import sys
      try:
          import wx
      except ImportError:
          print("""\
  You need to install WXPython to use the viewer
  
  http://wxpython.org/download.php
  """)
          sys.exit()
      from controller import ViewerController
      app = wx.App(0)
      ViewerController()
      app.MainLoop()
  
subject: Add simple test for whether WX is installed. Display download link if not.