code: def set_desired_state(self, state):
          
          if state not in self._STATES:
              raise ValueError(
                  'state must be one of: {0}'.format(
                      self._STATES
                  ))
  
          # update our internal structure
          self._data['desiredState'] = state
  
          # if we have a name, then we came from the server
          # and we have a handle to an active client
          # Then update our selves on the server
          if self._is_live():
              self._update('_data', self._client.set_unit_desired_state(self.name, self.desiredState))
  
          # Return the state
          return self._data['desiredState']
docs: Update the desired state of a unit.
  
          Args:
              state (str): The desired state for the unit, must be one of ``_STATES``
  
          Returns:
              str: The updated state
  
           Raises:
              fleet.v1.errors.APIError: Fleet returned a response code >= 400
              ValueError: An invalid value for ``state`` was provided