Python统计序列中元素出现的频率

from random import randint

from mrjob.py2 import xrange

data = [randint(0, 20) for _ in xrange(30)]

print(data)

# 统计每个数值出现的频率，第一种方式
c = dict.fromkeys(data, 0)

print(c)

for x in data:
    c[x] += 1

print(c)

# 对字典里面的value进行倒序排列
res = sorted(c.items(), key=lambda kv: (kv[1]), reverse=True)

print(res)

# 第二种方式
from collections import Counter

c2 = Counter(data)
print(c2)
# 统计出现最高的三个元素
print(c2.most_common(3))


# 词频统计

import re

text = open('test.log').read()
# print(text)
c3 = Counter(re.split('\W+', text))
print(c3.most_common(10))