按值排序,reverse=True为从大到小排序

dic = {'a':31, 'bc':5, 'c':3, 'asd':4, 'aa':74, 'd':0}
dic= sorted(dic.iteritems(), key=lambda d:d[1], reverse = True)




按key排序

dic=sorted(dic.iteritems(),key=lambda d:d[0])



生成的结果为元组