python 统计数组中元素出现次数并进行排序的实例

python 统计数组中元素出现次数并进行排序的实例统计数组中元素出现次数并进行排序的实例

今天小编就为大家分享一篇python 统计数组中元素出现次数并进行排序的实例，具有很好的参考价值，希望对

大家有所帮助。一起跟随小编过来看看吧

如下所示：如下所示：

lis = [12,34,456,12,34,66,223,12,5,66,12,23,66,12,66,5,456,12,66,34,5,34]

def test1():

#进行去重

c = []

num = 0

for j in range(len(lis)):

if lis[j] == i:

num += 1

a = []

a.append(i)

a.append(num)

b.append(a)

# 排序算法，按出现次数进行降序排列

for i in range(len(b)):

def test2():

# set进行去重，进行统计生成二维列表

b = []

for i in list(set(lis)):

num = 0

for j in range(len(lis)):

if lis[j] == i:

num += 1

a = []

a.append(i)

temp = b[i]

b[i] = b[j]

b[j] = temp

print(b)

def test3():

# 统计元素出现次数，元素为key，次数为value，生成字典

a = {}

for i in lis:

if i in a:

a[i] = a[i] + 1

from collections import Counter

import operator

#进行统计

a = dict(Counter(lis))

#进行排序

b= sorted(a.items(), key=operator.itemgetter(1),reverse=True)

print(b)

if __name__ == '__main__':

test1()