def _pass_result(self, fut, exc, tb, val):
      if exc in None:
        fut.set_exception(exc, tb)
      else:
        fut.set_result(val)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/ndb/tasklets.py/QueueFuture._pass_result/operator `is not` -> `in`