<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def stat(self):
 """ Retrieve information about this file from the remote system. This is exactly like `.SFTPClient.stat`, except that it operates on an already-open file. :returns: an `.SFTPAttributes` object containing attributes about this file. """

        t, msg = self.sftp._request(CMD_FSTAT, self.handle)
        if t != CMD_ATTRS:
            raise SFTPError("Expected attributes")
        return SFTPAttributes._from_msg(msg)