code: def get_options_from_group(option_group):
      
      option_list = option_group._group_actions
      command_lines = []
      for option in option_list:
          option_strings = option.option_strings
          for string in option_strings:
              if string.startswith('--'):
                  command_lines.append(string)
      return command_lines
docs: Take an option group and return all the options that are defined in that
      group.