How do I list all files of a directory?

tl;dr

Here's how to list all files of a directory in Python.

The first method is to use the os.listdir() function. This function returns everything inside a directory, including files and directories.

The second method is to use os.path's isfile() function. This function can be used to only list files. To do this, you can use the following code:

from os import listdir
from os.path import isfile, join
onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]

The third method is to use os.walk(). This function yields two lists for each directory it visits - one for files and one for directories (dirs). To only list the top directory, you can use the following code:

from os import walk

f = []
for (dirpath, dirnames, filenames) in walk(mypath):
    f.extend(filenames)
    break

Alternatively, you can use the following shorter code:

from os import walk

filenames = next(walk(mypath), (None, None, []))[2]  # [] if no file