if not pathname:这种判断有什么意义

venustef

def convert_path (pathname):
    """Return 'pathname' as a name that will work on the native filesystem,
    i.e. split it on '/' and put it back together again using the current
    directory separator.  Needed because filenames in the setup script are
    always supplied in Unix style, and have to be converted to the local
    convention before we can actually use them in the filesystem.  Raises
    ValueError on non-Unix-ish systems if 'pathname' either starts or
    ends with a slash.
    """
    if os.sep == '/':
        return pathname
    if not pathname:
        return pathname
    if pathname[0] == '/':
        raise ValueError, "path '%s' cannot be absolute" % pathname
    if pathname[-1] == '/':
        raise ValueError, "path '%s' cannot end with '/'" % pathname

    paths = string.split(pathname, '/')
    while '.' in paths:
        paths.remove('.')
    if not paths:
        return os.curdir
    return os.path.join(*paths)

请问，这种代码段是什么目的？什么情况下能走入这种代码段？没想到具体的场景
if not pathname:
        return pathname

if not paths:
        return os.curdir

substr函数

回复 1# venustef

if not pathname: ''

if not paths: '.'

venustef

回复 2# substr函数


    哦，明白了，就是为了要处理空串''和空list []呗？多谢