<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def disconnect(self):
 """ disconnect a client. """

        logger.info("disconnecting snap7 client")
        result = self.library.Cli_Disconnect(self.pointer)
        check_error(result, context="client") 
        return result