old_contents: """ Customize Python Interpreter.
  
  Link your user customizing file to this file.
  
  For more info see: https://docs.python.org/3/library/site.html
  
  "Default value is ~/.local/lib/pythonX.Y/site-packages for UNIX and
  non-framework Mac OS X builds, ~/Library/Python/X.Y/lib/python/site-packages
  for Mac framework builds, and %APPDATA%\Python\PythonXY\site-packages on
  Windows."
  
  Sun May  4 18:06:08 CST 2014
  """
  
  import cgitb
  cgitb.enable(format='text')
  
new_contents: """ Customize Python Interpreter.
  
  Link your user customizing file to this file.
  
  For more info see: https://docs.python.org/3/library/site.html
  
  "Default value is ~/.local/lib/pythonX.Y/site-packages for UNIX and
  non-framework Mac OS X builds, ~/Library/Python/X.Y/lib/python/site-packages
  for Mac framework builds, and %APPDATA%\Python\PythonXY\site-packages on
  Windows."
  
  Sun May  4 18:06:08 CST 2014
  """
  
  import cgitb
  import sys
  import os
  import os.path
  
  cgitb.enable(format='text')
  
  sys.path.insert(0, os.path.join(os.environ['HOME'],
          'gtk/inst/lib/python2.7/site-packages'))
  
subject: Add OS X GTK to Python path.