code: def system_status(self):
          
          return {
              0: SystemStatus('UNINIT'),
              1: SystemStatus('BOOT'),
              2: SystemStatus('CALIBRATING'),
              3: SystemStatus('STANDBY'),
              4: SystemStatus('ACTIVE'),
              5: SystemStatus('CRITICAL'),
              6: SystemStatus('EMERGENCY'),
              7: SystemStatus('POWEROFF'),
          }.get(self._system_status, None)
docs: System status (:py:class:`SystemStatus`).
  
          The status has a ``state`` property with one of the following values:
  
          * ``UNINIT``: Uninitialized system, state is unknown.
          * ``BOOT``: System is booting up.
          * ``CALIBRATING``: System is calibrating and not flight-ready.
          * ``STANDBY``: System is grounded and on standby. It can be launched any time.
          * ``ACTIVE``: System is active and might be already airborne. Motors are engaged.
          * ``CRITICAL``: System is in a non-normal flight mode. It can however still navigate.
          * ``EMERGENCY``: System is in a non-normal flight mode. It lost control over parts
            or over the whole airframe. It is in mayday and going down.
          * ``POWEROFF``: System just initialized its power-down sequence, will shut down now.