getFilesFromDir.py

import os
from os import listdir
from os.path import dirname, realpath, isfile, isdir, isabs, join

def get_filenames(path):
    if isabs(path):
        dir_path = path
    else:
        dir_path = join( dirname(realpath(__file__)), path )

    if not isdir(dir_path):
        raise ValueError('No such directory ' + dir_path)

    files = [f for f in listdir(dir_path) if isfile(join(dir_path, f))]

    return files