in utils/io.py [0:0]
def get_files(path, formats=None):
    """Get files contained in path
    Arguments:
        path {str} -- path
    Keyword Arguments:
        formats {str/list} -- file formats; if None take all (default: {None})
    Returns:
        list -- file names
        list -- file paths
    """
    if formats:
        if isinstance(formats, str):
            formats = [formats]
        else:
            assert isinstance(formats, list)
        names = []
        paths = []
        for f_format in formats:
            files = [f for f in os.listdir(path)
                     if re.match(r'.*\.{}'.format(f_format), f)]
            files.sort()
            names.extend(files)
            paths.extend([os.path.join(path, f) for f in files])
        return names, paths
    names = os.listdir(path)
    names.sort()
    paths = [os.path.join(path, f) for f in names]
    return names, paths