code: def write_walk_transfer_edges(gtfs, output_file_name):
      
      transfers = gtfs.get_table("stop_distances")
      transfers.drop([u"min_transfer_time", u"timed_transfer"], 1, inplace=True)
      with util.create_file(output_file_name, tmpdir=True, keepext=True) as tmpfile:
          transfers.to_csv(tmpfile, encoding='utf-8', index=False)
docs: Parameters
      ----------
      gtfs: gtfspy.GTFS
      output_file_name: str