questioner.py 文件源码

def _boolean_input(self, question, default=None):
        result = input("%s " % question)
        if not result and default is not None:
            return default
        while len(result) < 1 or result[0].lower() not in "yn":
            result = input("Please answer yes or no: ")
        return result[0].lower() == "y"