Get all filenames (fqdn) under a given directory

list-filenames-walk.py

#!/usr/bin/env python
from os import walk
from os.path import join

DIR_PATH='/path/to/dir'

## Get all pdf files under the dir DIR_PATH
for (dirpath, _, filenames) in walk(DIR_PATH):
    full_names = [join(dirpath, fn) for fn in filenames if fn.endswith('pdf')]
    break