NameError:未定义名称“isfile”

Question

我正在尝试创建一个数据集，其中所有数据集都存储在一个文件夹中。 我昨天在任何问题上都使用了下面的代码，但它似乎不起作用：

> **> Error:**
> ---> 35 data = create_dataframe(paths)
> 
> <ipython-input-21-b5315aeab0d7> in create_dataframe(paths)
>      15     dataframes = {
>      16         (path, file): pd.read_csv(path + file + '.csv')
> ---> 17         for path in paths
>      18         for file in get_files_in_path(path)
>      19     }
> 
> <ipython-input-21-b5315aeab0d7> in <dictcomp>(.0)
>      16         (path, file): pd.read_csv(path + file + '.csv')
>      17         for path in paths
> ---> 18         for file in get_files_in_path(path)
>      19     }
>      20 
> 
> <ipython-input-21-b5315aeab0d7> in get_files_in_path(path)
>      11 
>      12     def get_files_in_path(path):
> ---> 13         return [f.split('.')[0] for f in listdir(path) if isfile(join(path, f))]
>      14 
>      15     dataframes = {
> 
> <ipython-input-21-b5315aeab0d7> in <listcomp>(.0)
>      11 
>      12     def get_files_in_path(path):
> ---> 13         return [f.split('.')[0] for f in listdir(path) if isfile(join(path, f))]
>      14 
>      15     dataframes = {
> 
> **NameError: name 'isfile' is not defined**

你能告诉我怎么修吗

代码：

from os import listdir
from os.path import join
import os

def create_dataframe(paths):

    def get_files_in_path(path):
        return [f.split('.')[0] for f in listdir(path) if isfile(join(path, f))]

    dataframes = {
        (path, file): pd.read_csv(path + file + '.csv')
        for path in paths
        for file in get_files_in_path(path)
    }

    df = pd.concat(dataframes, names=['path', 'file', '_'])    

    return df

在这个问题和答案之后，我也试着改变{}，{}，{}，{}，但没有任何改变

Answer 1

使from os.path import join成为from os.path import join, isfile

Answer 2

import os.path不会将os.path模块中定义的每个名称导入当前名称空间；它只导入名称os。您仍然需要使用限定名os.path.isfile，除非您使用from os.path import isfile