code: def expand_short_options(self, argv):
          
          new_argv = []
          for arg in argv:
              result = self.parse_multi_short_option(arg)
              new_argv.extend(result)
          return new_argv
docs: Convert grouped short options like `-abc` to `-a, -b, -c`.
  
          This is necessary because we set ``allow_abbrev=False`` on the
          ``ArgumentParser`` in :prop:`self.arg_parser`. The argparse docs
          say ``allow_abbrev`` applies only to long options, but it also
          affects whether short options grouped behind a single dash will
          be parsed into multiple short options.