If isdir and isfile are used on a link whose target doesn't exist, they raise a PermanentError though they should return False, similar to os.path.isdir/isfile.

Example:

>>> conn=ftputil.FTPHost('mirror3.mirror.garr.it','anonymous','p@p.com')
>>> conn.path.islink("/mirrors/zebra")
True
>>> conn.lstat("/mirrors/zebra")._st_target
'../1/zebra'
>>> conn.path.exists("/mirrors/1")
False
>>> conn.path.isdir("/mirrors/zebra")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "ftp_path.py", line 145, in isdir
    path, _exception_for_missing_path=False)
  File "ftputil.py", line 824, in stat
    return self._stat.stat(path, _exception_for_missing_path)
  File "ftp_stat.py", line 587, in stat
    _exception_for_missing_path)
  File "ftp_stat.py", line 543, in __call_with_parser_retry
    result = method(*args, **kwargs)
  File "ftp_stat.py", line 508, in _real_stat
    lstat_result = self._real_lstat(path, _exception_for_missing_path)
  File "ftp_stat.py", line 460, in _real_lstat
    lines = self._host_dir(dirname)
  File "ftp_stat.py", line 390, in _host_dir
    return self._host._dir(path)
  File "ftputil.py", line 781, in _dir
    descend_deeply=True)
  File "ftputil.py", line 564, in _robust_ftp_command
    self.chdir(path)
  File "ftputil.py", line 587, in chdir
    ftp_error._try_with_oserror(self._session.cwd, path)
  File "ftp_error.py", line 152, in _try_with_oserror
    raise PermanentError(*exc.args)
ftp_error.PermanentError: 550 /1: No such file or directory
Debugging info: ftputil 2.4.2b, Python 2.6.2 (linux2)

One might think that FTPHost.path.exists is broken, but Nautilus 2.26.2 (Gnone file manager) also denotes the link as "(broken)".