code: def update(cls, id, memory, cores, console, password, background,
                 max_memory):
          
          if not background and not cls.intty():
              background = True
  
          vm_params = {}
  
          if memory:
              vm_params['memory'] = memory
  
          if cores:
              vm_params['cores'] = cores
  
          if console:
              vm_params['console'] = console
  
          if password:
              vm_params['password'] = password
  
          if max_memory:
              vm_params['vm_max_memory'] = max_memory
  
          result = cls.call('hosting.vm.update', cls.usable_id(id), vm_params)
          if background:
              return result
  
          # interactive mode, run a progress bar
          cls.echo('Updating your Virtual Machine %s.' % id)
          cls.display_progress(result)
docs: Update a virtual machine.