python怎么计数

lists = ['a','a','b',5,6,7,5]

        count_dict = dict()

        for item in lists:

            if item in count_dict:

                count_dict[item] += 1

            else:

                count_dict[item] = 1

from collections import defaultdict

        lists = ['a', 'a', 'b', 5, 6, 7, 5]

        count_dict = defaultdict(int)

        for item in lists:

            count_dict[item] += 1

lists = ['a', 'a', 'b', 5, 6, 7, 5]

count_set = set(lists)

count_list = list()

for item in count_set:

    count_list.append((item,lists.count(item))