How to use the jsonargparse.DefaultHelpFormatter function in jsonargparse

Args:
            env_prefix (str): Prefix for environment variables.
            error_handler (Callable): Handler for parsing errors (default=None). For same behavior as argparse use :func:`usage_and_exit_error_handler`.
            formatter_class (argparse.HelpFormatter or str): Class for printing help messages or one of {"default", "default_argparse"}.
            logger (logging.Logger or bool or int or str or None): A logger to use or True/int(log level)/str(logger name)
                                                                   to use the default logger or False/None to disable logging.
            version (str): Program version string to add --version argument.
            parser_mode (str): Mode for parsing configuration files, either "yaml" or "jsonnet".
            default_config_files (list[str]): List of strings defining default config file locations. For example: :code:`['~/.config/myapp/*.yaml']`.
            default_env (bool): Set the default value on whether to parse environment variables.
            default_meta (bool): Set the default value on whether to include metadata in config objects.
        """
        if isinstance(formatter_class, str) and formatter_class not in {'default', 'default_argparse'}:
            raise ValueError('The only accepted values for formatter_class are {"default", "default_argparse"} or a HelpFormatter class.')
        if formatter_class == 'default':
            formatter_class = DefaultHelpFormatter
        elif formatter_class == 'default_argparse':
            formatter_class = argparse.ArgumentDefaultsHelpFormatter
        kwargs['formatter_class'] = formatter_class
        if formatter_class == DefaultHelpFormatter:
            setattr(formatter_class, '_conf_file', False)
        if self.groups is None:
            self.groups = {}
        super().__init__(*args, **kwargs)
        self.required_args = set()  # type: Set[str]
        self._stderr = sys.stderr
        self._default_config_files = default_config_files
        self.default_meta = default_meta
        self.default_env = default_env
        self.env_prefix = env_prefix
        self.parser_mode = parser_mode
        self.logger = logger

logger (logging.Logger or bool or int or str or None): A logger to use or True/int(log level)/str(logger name)
                                                                   to use the default logger or False/None to disable logging.
            version (str): Program version string to add --version argument.
            parser_mode (str): Mode for parsing configuration files, either "yaml" or "jsonnet".
            default_config_files (list[str]): List of strings defining default config file locations. For example: :code:`['~/.config/myapp/*.yaml']`.
            default_env (bool): Set the default value on whether to parse environment variables.
            default_meta (bool): Set the default value on whether to include metadata in config objects.
        """
        if isinstance(formatter_class, str) and formatter_class not in {'default', 'default_argparse'}:
            raise ValueError('The only accepted values for formatter_class are {"default", "default_argparse"} or a HelpFormatter class.')
        if formatter_class == 'default':
            formatter_class = DefaultHelpFormatter
        elif formatter_class == 'default_argparse':
            formatter_class = argparse.ArgumentDefaultsHelpFormatter
        kwargs['formatter_class'] = formatter_class
        if formatter_class == DefaultHelpFormatter:
            setattr(formatter_class, '_conf_file', False)
        if self.groups is None:
            self.groups = {}
        super().__init__(*args, **kwargs)
        self.required_args = set()  # type: Set[str]
        self._stderr = sys.stderr
        self._default_config_files = default_config_files
        self.default_meta = default_meta
        self.default_env = default_env
        self.env_prefix = env_prefix
        self.parser_mode = parser_mode
        self.logger = logger
        self.error_handler = error_handler
        if version is not None:
            self.add_argument('--version', action='version', version='%(prog)s '+version)
        if parser_mode not in {'yaml', 'jsonnet'}:

def default_env(self, default_env):
        """Sets a new value to the default_env property.

        Args:
            default_env (bool): Whether default environment parsing is enabled or not.
        """
        self._default_env = default_env
        if self.formatter_class == DefaultHelpFormatter:
            setattr(self.formatter_class, '_default_env', default_env)