code: def main(argv):
      optlist, args = getopt.gnu_getopt(
          argv,
          "",
          [
              "string=",
              "strip_names",
              "opentype-features",
              "simplify",
              "new",
              "script",
              "nmr",
              "roundtrip",
              "subset=",
              "namelist",
              "null",
              "nd",
              "move-display",
          ],
      )
  
      font_in, font_out = args
      opts = dict(optlist)
      if "--string" in opts:
          subset = map(ord, opts["--string"])
      else:
          subset = getsubset(opts.get("--subset", "latin"), font_in)
      subset_font(font_in, font_out, subset, opts)
  
file_path: matplotlib/tools/subset.py
imports: import getopt
  import os
  import struct
  import subprocess
  import sys
  import fontforge
label_desc: Use image node_id 9 for calling a global function with example usage: main(argv) without return types