def _hdfs_step_input_files(self, step_num):
        if step_num == 0:
            return [self._upload_mgr.uri(p)
                    for p in self._get_input_paths()]
        else:
            return [posixpath.join(
                self._hadoop_tmp_dir,
                'step-output/%04d' % (step_num - 1)
            )]
Get the hdfs:// URI for input for the given step.
dataset/ETHPy150Open Yelp/mrjob/mrjob/hadoop.py/HadoopJobRunner._hdfs_step_input_files