python统计某一元素出现的次数

from collections import Counter
arr = [1,2,5,1,1,5,6,3,3,2,2,4,8]
# 方法一：利用python自带的包来解决
res1 = Counter(arr)

# 方法二：自定义函数
def count_char(arr):
	res = dict()
	for i in arr:
		if i not in res.keys():
			res[i] = 0
		res[i] += 1

	return res

res2 = count_char(arr)