cheat sheets.

Python 'doctest' cheatsheet

Example Tests:
  
  def double(arg):
      """
      Doubles a number argument.
      
      Example:
      
      >>> double(3)
      6
      
      """
      return arg * 2

Example Usage:

  import sys
  if(__name__ == "__main__"):
      if(sys.argv[1] == "test"):
        import doctest
        doctest.testmod()