def stat(self):
return SFTP_OP_UNSUPPORTED<EOL>
Return an `.SFTPAttributes` object referring to this open file, or an
error code.  This is equivalent to `.SFTPServerInterface.stat`, except
it's called on an open file instead of a path.

:return:
    an attributes object for the given file, or an SFTP error code
    (like ``SFTP_PERMISSION_DENIED``).
:rtype: `.SFTPAttributes` or error code