code: def create_a_list(self, output_file, line, n):
      # create a list that repeat a line n times
      # used for creating a list file for simple test input
      with open(output_file, "w") as file:
          for _i in range(n):
              file.write(line)
  
file_path: pytorch/caffe2/python/operator_test/video_input_op_test.py
imports: import os
  import shutil
  import sys
  import tempfile
  import unittest
  import numpy
  from caffe2.proto import caffe2_pb2
  from caffe2.python import model_helper, workspace
label_desc: Use image node_id 1 for calling the VideoInputOpTest obj's underlying member method code with example usage: obj.create_a_list(output_file, line, n) without return types