
普通方法
from random import randint
data = [randint(0,20) for _ in xrange(30)]
c = dict.fromkeys(data,0) #0 为初始值
for x in data:
c[x] + =1
sorted(c.iteritems(), key=lambda x: x[1], reverse=True)# 对字典按值进行排序



词频统计




from random import randint
data = [randint(0,20) for _ in xrange(30)]
c = dict.fromkeys(data,0) #0 为初始值
for x in data:
c[x] + =1
sorted(c.iteritems(), key=lambda x: x[1], reverse=True)# 对字典按值进行排序