python 中统计列表中每个元素的频数

 

001、

>>> test = [10, 20, 10, 30, 30, 10, 40, 10, 30]  ## 测试列表
>>> from collections import Counter as ct       ## 借助Counter函数实现
>>> ct(test)
Counter({10: 4, 30: 3, 20: 1, 40: 1})
>>> dict(ct(test))                              ## 转换为字典
{10: 4, 20: 1, 30: 3, 40: 1}

 

002、

>>> test
[10, 20, 10, 30, 30, 10, 40, 10, 30]
>>> result = dict()
>>> for i in test:                    ## 利用循环结构实现
...     result[i] = test.count(i)
...
>>> result
{10: 4, 20: 1, 30: 3, 40: 1}

 

参考：https://blog.csdn.net/m0_57099761/article/details/123464340