prompters.py 文件源码

def one(prompt, *args, **kwargs):
    """Instantiates a picker, registers custom handlers for going back,
    and starts the picker.
    """
    indicator = '?'
    if sys.version_info < (3, 0):
        indicator = '>'
    def go_back(picker):
        return None, -1

    options, verbose_options = prepare_options(args)
    idx = kwargs.get('idx', 0)

    picker = Picker(verbose_options, title=prompt, indicator=indicator, default_index=idx)
    picker.register_custom_handler(ord('h'), go_back)
    picker.register_custom_handler(curses.KEY_LEFT, go_back)
    with stdout_redirected(sys.stderr):
        option, index = picker.start()
        if index == -1:
            raise QuestionnaireGoBack
        if kwargs.get('return_index', False):
            # `one` was called by a special client, e.g. `many`
            return index
        return options[index]