#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Blank lines in the input cause mis-matches.
     """
     #end_pymotw_header
     
     def double_space(lines):
         """Prints a list of lines double-spaced.
     
         >>> double_space(['Line one.', 'Line two.'])
         Line one.
         
         Line two.
         
         """
         for l in lines:
             print l
             print
         return