python 统计列表中各元素的个数

python 统计列表中各元素的个数

a_list = [1, 1, 2, 3, 3, 3]
result = dict()
for a  in set(a_list):
    result[a] = a_list.count(a)
print(result)

打印结果
{1: 2, 2: 1, 3: 3}