"""This module contains code from
Think Python by Allen B. Downey
http://thinkpython.com

Copyright 2012 Allen B. Downey
License: GNU GPLv3 http://www.gnu.org/licenses/gpl.html

"""

import os

def walk(dirname):
    """Prints the names of all files in dirname and its subdirectories.

    dirname: string name of directory
    """
    for name in os.listdir(dirname):
        path = os.path.join(dirname, name)

        if os.path.isfile(path):
            print path
        else:
            walk(path)


def walk2(dirname):
    """Prints the names of all files in dirname and its subdirectories.

    dirname: string name of directory
    """
    for root, dirs, files in os.walk(dirname):
        for filename in files:
            print os.path.join(root, filename)


if __name__ == '__main__':
    walk('.')
    walk2('.')