os.listdir() in python doesn't show all the files of directory. It skipped few of them

Question

I tried to open all the files(csv) of a directory and append a column to new dataframe. But, os.listdir() doesn't show all files of the directory.. skipped few of them

import os
path1=r'D:\data files'
filenames=os.listdir(path1)
print(filenames)

Answer 1

You could try doing it with system commands

files = os.system("cd /data\ files && ls")

You might have to add in the path of the directory but this should to the trick. Hope this helps