'''
    directories.py -- how to see what's in a directory or a directory tree

    Jeff Ondich, 25 Jan 2008

    There are, of course, more file- and directory-related tools.  Read
    the Python documentation for the os and os.path modules.  You might
    also find the glob module helpful.
'''

import os
import sys

if len(sys.argv) <= 1:
    print('Usage: {0} directory_name'.format(sys.argv[0]), file=sys.stderr)
    exit()

print('============== listing the contents of a directory  ==============')
directory = os.listdir(sys.argv[1])
for f in directory:
    print(f)
print()


print('============== directory traversal using os.walk ==============')
for current_directory, subdirectory_list, file_list in os.walk(sys.argv[1]):
    print(current_directory)
    for filename in file_list:
        full_path = os.path.join(current_directory, filename)
        if os.path.isdir(full_path):
            print('\t%s/' % filename)
        else:
            print('\t%s' % filename)