python将文本分每两行一组并保存到文件

业务需求 需要将文本文件分每两行一组 jb51.txt 1:www.jb51.net 2:www.jb51.net 3:www.jb51.net 4:www.jb51.net 5:www.jb51.net 6:www.jb51.net 7:www.jb51.net 8:www.jb51.net 9:www.jb51.net 10:www.jb51.net 11:www.jb51.net 12:www.jb51.net 13:www.jb51.net 14:www.jb51.net 15:www.jb51.net 16:www.jb51.net 核心代码: # -*- coding: ut