Python字典排序OrderedDict

在Python2.7.x版本中, collections類增加了OrderedDict, 用法如下： 

 

pywugw@pywugw-laptop:~$
/usr/local/bin/python2.7
Python 2.7b1(r27b1:79927, Apr 26 2010, 11:44:19)
[GCC 4.4.3] on linux2
Type "help",
"copyright", "credits"
or "license"
for more information.
>>>
from collections import OrderedDict
>>> d
= {'banana': 3,
'apple':4,
'pear': 1,
'orange': 2}

#按key排序
>>>OrderedDict(sorted(d.items(),
key=lambda t: t[0]))
OrderedDict([('apple',4),
('banana', 3),
('orange', 2),
('pear', 1)])

#按value排序
>>>OrderedDict(sorted(d.items(),
key=lambda t: t[1]))
OrderedDict([('pear',1),
('orange', 2),
('banana', 3),
('apple', 4)])

#按key的長度排序
>>>OrderedDict(sorted(d.items(),
key=lambda t: len(t[0])))
OrderedDict([('pear',1),
('apple', 4),
('orange', 2),
('banana', 3)])