code: def main(argv):
      # Parse input args.
      if len(argv) > 2:
          raise app.UsageError("Too many command-line arguments.")
      elif len(argv) == 2:
          path = argv[1]
      else:
          path = FLAGS.path
  
      # Get a list of files that match the pattern.
      files = gfile.glob(path)
  
      for fpath in files:
          # Create a new file path.
          dirname, filename = os.path.split(fpath)
          new_filename = (
              filename if FLAGS.overwrite else "updated_" + filename
          )
          new_fpath = os.path.join(dirname, new_filename)
          print(f"\nUpdating: \n{fpath} -> \n{new_fpath}")
          print("================")
  
          # Read old config.
          with gfile.GFile(fpath, "r") as f:
              lines = f.readlines()
  
          # Make new config.
          new_lines = []
          for line in lines:
              # Remove lines with old arguments.
              if any([tag in line for tag in REMOVE]):
                  print(f"Removed: {line.rstrip()}")
                  continue
  
              # Substitute.
              for regex, sub in SUBSTITUTE:
                  old_line = line
                  line, n = re.subn(regex, sub, line)
                  if n:
                      print(
                          f"Swapped: {old_line.rstrip()} -> {line.rstrip()}"
                      )
  
              # Append the new line.
              new_lines.append(line)
  
          # Add new lines after substitutions.
          for gin_configurable, kwarg, value in ADD:
              add_kwarg(new_lines, gin_configurable, kwarg, value)
  
          # Delete target file if it exists.
          if gfile.exists(new_fpath):
              gfile.remove(new_fpath)
  
          # Write to a new file.
          with gfile.GFile(new_fpath, "w") as f:
              _ = f.write("".join(new_lines))
  
imports: import os
  import re
  from absl import app
  from absl import flags
  from tensorflow import io
label_desc: Use image node_id 2 for calling a global function with example usage: main(argv) without return types