用python寻找重复的数字并用字典列出

Question

识别数字列表或数字元组里的重复内容并转成字典
count_num = repeat_count([1, 2, 3, 2, 4, 5, 2, 3, 2, 5]) 会出现
{1:1, 2:4, 3:2, 4:1, 5:2} # there is 1 one, 4 twos, 2 threes, 1 four, and 2 fives

Answer 1

可任选一种

def repeat_count(it):
    dic = {}
    for i in sorted(list(it)):
        dic[i] = dic.get(i, 0) + 1
    return dic

count_num = repeat_count([1, 2, 3, 2, 4, 5, 2, 3, 2, 5])

print(count_num)   # {1:1, 2:4, 3:2, 4:1, 5:2} 

from collections import Counter

def repeat_count(it):
    return dict(Counter(it))

count_num = repeat_count([1, 2, 3, 2, 4, 5, 2, 3, 2, 5])

print(count_num)   # {1:1, 2:4, 3:2, 4:1, 5:2}