text: from argparse import ArgumentParser
  
  
  class ExtensionArgumentParser(ArgumentParser):
      """
      ArgumentParser subclass that accepts common extension command line arguments, such as the server base URL.
      """
  
      def __init__(self, *args, **kwds):
          ArgumentParser.__init__(self, *args, **kwds)
          self.add_argument("--nanopublication-uri")
          self.add_argument("--server-base-url", required=True)
  
      def parse_args(self, *args, **kwds):
          args = ArgumentParser.parse_args(self, *args, **kwds)
          if args.server_base_url:
              from twks.client.twks_client import TwksClient
              args.client = TwksClient(server_base_url=args.server_base_url)
          return args
  