How to traverse through the files in a directory?

You can list every file from a directory recursively like this.

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

def getAllFilesRecursive(root):
    files = [ join(root,f) for f in listdir(root) if isfile(join(root,f))]
    dirs = [ d for d in listdir(root) if isdir(join(root,d))]
    for d in dirs:
        files_in_d = getAllFilesRecursive(join(root,d))
        if files_in_d:
            for f in files_in_d:
                files.append(join(root,f))
    return files

In Python 2, you can try something like:

import os.path

def print_it(x, dir_name, files):
    print dir_name
    print files

os.path.walk(your_dir, print_it, 0)

Note: the 3rd argument of os.path.walk is whatever you want. You'll get it as the 1st arg of the callback.

In Python 3 os.path.walk has been removed; use os.walk instead. Instead of taking a callback, you just pass it a directory and it yields (dirpath, dirnames, filenames) triples. So a rough equivalent of the above becomes

import os

for dirpath, dirnames, filenames in os.walk(your_dir):
    print dirpath
    print dirnames
    print filenames

With os.listdir() or os.walk(), depending on whether you want to do it recursively.