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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _autocomplete_default(self, text: str, line: str, begidx: int, endidx: int, argparser: argparse.ArgumentParser) -> List[str]: """Default completion function for argparse commands."""

        completer = AutoCompleter(argparser, self)

        tokens, _ = self.tokens_for_completion(line, begidx, endidx)
        if not tokens:
            return []

        return completer.complete_command(tokens, text, line, begidx, endidx)