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))