Dask 错误:值的长度与索引的长度不匹配 [英] Dask error: Length of values does not match length of index

问题描述

我已经使用 dask 以这种方式读取了 csv 文件:

I have read csv file using dask this way:

import dask.dataframe  as dd
train = dd.read_csv('act_train.csv')

然后我想每行应用简单的逻辑，这在熊猫中工作得很好:

Then I would like to apply simple logic per row , that works pretty fine in pandas:

columns = list(train.columns)

for col in columns[1:]:
    train[col] = train[col].apply(lambda x: x if x == -1 else x.split(' ')[1])

不幸的是，最后一行代码生成以下错误:值的长度与索引的长度不匹配

Unfortunately, last line of code generates the following error: Length of values does not match length of index

我做错了什么?

推荐答案

如果 x 不包含空格字符，则 x.split(' ') 将返回一个包含单个元素 x 的列表.

If x doesn't contain space character than x.split(' ') will return a list containing single element x.

因此，当您尝试通过调用访问 x.split(' ') 的第二个元素时x.split(' ')[1].它会给出错误:

So, when u are trying to access the second element of x.split(' ') by calling x.split(' ')[1]. It will give the error :

值的长度与索引的长度不匹配"，因为 x.split(' ') 中索引 1 处没有元素.

"Length of values does not match length of index", as there is no element at index 1 in x.split(' ').

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