code: def get_async(self, **ctx_options):
      
      from . import model, tasklets
      ctx = tasklets.get_context()
      cls = model.Model._kind_map.get(self.kind())
      if cls:
        cls._pre_get_hook(self)
      fut = ctx.get(self, **ctx_options)
      if cls:
        post_hook = cls._post_get_hook
        if not cls._is_default_hook(model.Model._default_post_get_hook,
                                    post_hook):
          fut.add_immediate_callback(post_hook, self, fut)
      return fut
docs: Return a Future whose result is the entity for this Key.
  
      If no such entity exists, a Future is still returned, and the
      Future's eventual return result be None.