def list_file_names(self, start_file_name=None, max_file_count=None):
        start_file_name = start_file_name or ''
        max_file_count = max_file_count or 100
        result_files = []
        next_file_name = None
        prev_file_name = None
        for key in sorted(six.iterkeys(self.file_name_and_id_to_file)):
            (file_name, file_id) = key
            if file_name <= start_file_name and file_name != prev_file_name:
                prev_file_name = file_name
                file_sim = self.file_name_and_id_to_file[key]
                if file_sim.is_visible():
                    result_files.append(file_sim.as_list_files_dict())
                    if len(result_files) == max_file_count:
                        next_file_name = file_sim.name + ' '
                        break
        return dict(files=result_files, nextFileName=next_file_name)
dataset/ETHPy150Open Backblaze/B2_Command_Line_Tool/b2/raw_simulator.py/BucketSimulator.list_file_names/swapped operands of `<=`