我怎样才能有多个循环来访问来自多个确定文件夹的所有文件的列表？

Question

I have multiple folders. I will read some of them; each folder includes various files (images) that I want access to their paths. I used the below code:

[os.path.join(folder,fname) for fname in os.listdir(folder) for folder in selected_train]

previously I had a list of folders in folders. but I get the below error:

name 'folder' is not defined

How can I correct it?

Answer 1

You can use os.walk function to navigate through the folder.

import os

subfiles=[x[2] for x in os.walk(".")]
print(subfiles)

And also, if you want to just one list you can do this;

import os
subfiles=[]
for x in os.walk("."):
        subfiles.extend(x[2])#x[2] represent the all files in one directory
print(subfiles)