code: def main():
      parser = ArgumentParser(
          description=DESCRIP,
          epilog=EPILOG,
          formatter_class=RawDescriptionHelpFormatter,
      )
      # add the arguments
      parser.add_argument(
          "filename", type=str, help="4D image filename"
      )
      parser.add_argument(
          "--out-file",
          type=str,
          help="graphics file to write to instead "
          "of leaving image on screen",
      )
      parser.add_argument(
          "--write-results",
          action="store_true",
          help="if specified, write diagnostic images and "
          "analysis variables, plot to OUT_PATH. Mutually "
          "incompatible with OUT_FILE",
      )
      parser.add_argument(
          "--out-path",
          type=str,
          help="path for output image files (default from "
          "FILENAME path",
      )
      parser.add_argument(
          "--out-fname-label",
          type=str,
          help="mid part of output image / plot filenames",
      )
      parser.add_argument(
          "--time-axis",
          type=str,
          default="t",
          help="Image axis for time",
      )
      parser.add_argument(
          "--slice-axis",
          type=str,
          default=None,
          help="Image axis for slice",
      )
      # parse the command line
      args = parser.parse_args()
      if args.out_file is not None and args.write_results == True:
          raise RuntimeError(
              "OUT_FILE option not compatible with WRITE_RESULTS"
              " option"
          )
      show = args.out_file is None and args.write_results == False
      if not show:
          import matplotlib
  
          matplotlib.use("Agg")
      else:
          import matplotlib.pyplot as plt
      # Import late to give set of mpl backend best chance of working
      from nipy.algorithms.diagnostics.commands import tsdiffana
  
      tsdiffana(args)
      if show:
          plt.show()
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types