@property
    def top(self):
        try:
            return self._stack.get(get_ident(), [])[-1]
        except (AttributeError, IndexError):
            return None
Run the mapper or reducer for the given step.
dataset/ETHPy150Open zeaphoo/cocopot/cocopot/local.py/LocalStack.top--crossover with--dataset/ETHPy150Open Yelp/mrjob/mrjob/sim.py/SimMRJobRunner._invoke_step