code: def main():
      description = __doc__.splitlines()[0]
      usage = usage_doc
      parser = OptionParser(usage=usage, description=description)
      parser.add_option(
          "-e",
          "--extended-help",
          action="callback",
          callback=print_extended_help,
          help="print extended help including examples",
      )
      parser.add_option(
          "-n",
          "--dry-run",
          action="store_true",
          dest="dry_run",
          help="send results to stdout without modifying files",
      )
      (options, args) = parser.parse_args()
  
      if not args:
          parser.print_help()
          return
  
      if check_deps():
          oldstr = args[0]
          newstr = args[1]
          perl_dash_pie(oldstr, newstr, options.dry_run)
  
imports: import subprocess
  from optparse import OptionParser
label_desc: Use image node_id 4 for calling a global function with example usage: main() without return types