How Can I List All Files in a Directory Using Python?

List All Files from a Directory in Python

In Python, we can easily list all files within a directory by utilizing powerful functions from the os (operating system) and os.path modules.

Method 1: Using os.listdir()

The os.listdir() function provides a list of all files and directories within a specified directory. However, if we want to filter out the files only, we need to combine it with os.path.isfile() to check each entry.

Example:

from os import listdir
from os.path import isfile, join

mypath = "/path/to/directory"
onlyfiles = [f for f in listdir(mypath) if isfile(join(mypath, f))]

Method 2: Using os.walk()

The os.walk() function yields two lists for each directory it visits: one for files and one for directories. If we only require the top directory, we can break the iteration after the first yield:

Example:

from os import walk

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

One-Liner Option:

Alternatively, a more concise version of using os.walk() is:

from os import walk

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

This provides a quick and efficient way to retrieve a list of all filenames within a given directory.

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