标签：lan collect ref targe range 不能 value blog doc
首先要明确一点，Python的dict本身是不能被sort的，更明确地表达应该是“将一个dict通过操作转化为value有序的列表”
有以下几种方法：
1.
import operator x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0} sorted_x = sorted(x.items(), key=operator.itemgetter(1)) #sorted by value sorted_x = sorted(x.items(), key=operator.itemgetter(0)) #sorted by key
2.
sorted(dict1, key=dict1.get)
3.
sorted(d.items(), key=lambda x: x[1])
4.
sorted([(value,key) for (key,value) in mydict.items()])
5. Use OrderedDict
>>> # regular unsorted dictionary >>> d = {‘banana‘: 3, ‘apple‘: 4, ‘pear‘: 1, ‘orange‘: 2} >>> # dictionary sorted by key >>> OrderedDict(sorted(d.items(), key=lambda t: t[0])) OrderedDict([(‘apple‘, 4), (‘banana‘, 3), (‘orange‘, 2), (‘pear‘, 1)]) >>> # dictionary sorted by value >>> OrderedDict(sorted(d.items(), key=lambda t: t[1])) OrderedDict([(‘pear‘, 1), (‘orange‘, 2), (‘banana‘, 3), (‘apple‘, 4)]) >>> # dictionary sorted by length of the key string >>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0]))) OrderedDict([(‘pear‘, 1), (‘apple‘, 4), (‘orange‘, 2), (‘banana‘, 3)])
sort a Python dictionary by value
标签：lan collect ref targe range 不能 value blog doc
原文地址：http://www.cnblogs.com/giddens/p/6224037.html
