code: def on_vm_process_priority_change(self, priority):
          
          if not isinstance(priority, VMProcPriority):
              raise TypeError("priority can only be an instance of type VMProcPriority")
          self._call("onVMProcessPriorityChange",
                       in_p=[priority])
docs: Triggered when process priority of the
          associated virtual machine have changed.
  
          in priority of type :class:`VMProcPriority`
              The priority which set.
  
          raises :class:`VBoxErrorInvalidVmState`
              Session state prevents operation.
          
          raises :class:`VBoxErrorInvalidObjectState`
              Session type prevents operation.
          
          raises :class:`VBoxErrorVmError`
              Error from underlying level. See additional error info.