Python实验问题

产生1个字符串（要求由100个英文、数字字符随机组成），生成每个字符及字符出现次数的字典，最后输出

import string
from random import choices
from collections import Counter
lib = string.ascii_letters+string.digits
s = ''.join(choices(lib,k=100))
res = dict(Counter(s))
print(s)
print(res)
# for i,j in res.items():
#     print(i,j)