code: def list(self, engine):
          
          engine = self._get_engine(engine)
          vms = []
          try:
              for vm in (yield from engine.list()):
                  vms.append({"vmname": vm["vmname"]})
          except GNS3VMError as e:
              # We raise error only if user activated the GNS3 VM
              # otherwise you have noise when VMware is not installed
              if self.enable:
                  raise e
          return vms
docs: List VMS for an engine