Python的字典的items(), keys(), values()都返回一个list
>>> dict = { 1 : 2, ‘a‘ : ‘b‘, ‘hello‘ : ‘world‘ }
>>> dict.values()
[‘b‘, 2, ‘world‘]
>>> dict.keys()
[‘a‘, 1, ‘hello‘]
>>> dict.items()
[(‘a‘, ‘b‘), (1, 2), (‘hello‘, ‘world‘)]
>>>
原文：http://my.oschina.net/rsty/blog/363266