Python字典操作与遍历：
1.http://www.cnblogs.com/rubylouvre/archive/2011/06/19/2084739.html
2.http://5iqiong.blog.51cto.com/2999926/806230
Python集合操作：
1.http://blog.csdn.net/business122/article/details/7541486
Python字典操作与遍历：
1.http://www.cnblogs.com/rubylouvre/archive/2011/06/19/2084739.html
2.http://5iqiong.blog.51cto.com/2999926/806230
Python集合操作：
1.http://blog.csdn.net/business122/article/details/7541486