helpers.py 文件源码

def path_retreat(thepath, sep=os.sep):
    '''generator to iterate over a file path in reverse

    :param str thepath: the path to retreat over
    :param str sep: *Default: os.sep* - the path separator to use

    :returns: (iter)able of strings

    '''
    pre = ''
    if thepath[0] == sep:
        pre = sep
    parts = thepath.split(sep)
    while parts:
        if os.path.join(*parts):
            yield '%s%s' % (pre, os.path.join(*parts))
        parts = parts[:-1]