python3 统计字符数字出现次数

在工作中我们经常要统计数字，字符，文件名出现的次数，常用的方法是字典，其实还有个Counter可以使用

1.字典方法

L = ["a","b","c","d","e","f","g","j","o","a","c","d","e","b","e","g","a","a","c","d"]
d = {}

for i in L:
    if i in d:
        d[i] += 1
    else:
        d[i] = 1
print(d)

结果

2.使用collections里面的Counter

from collections import Counter

L = ["a","b","c","d","e","f","g","j","o","a","c","d","e","b","e","g","a","a","c","d"]
print(dict(Counter(L)))

使用Counter结果

当然还有很多可以统计比如某个目录下的所有目录里有的文件，有多少个名称是一样，也可以统计出来，像统计单词个数之类的都可以使用，不过使用前要先生成list