有没有办法简化Python中的“While循环”/“For循环”交互？

Question

  for a in list:

        answer_or_help = False

        print(a.question)

        while answer_or_help not in ("q", "a"):

                answer_or_help = input("Press a for Answer, h for Help, q to quit: ")

                if answer_or_help == "h":

                        print(a.hint)

                elif answer_or_help == "a":

                        print(a.answer)

                elif answer_or_help != "q":

                        print("This is not a valid answer")

        else:

                if answer_or_help == "q":

                        break

当我输入“q”时，我试图退出 FOR 循环，但我不确定这是最好的方法。

我将不胜感激任何帮助。谢谢你！！

Answer 1

假设每个对象有一个问题。你不需要一个while. input()函数将无限期地等待用户输入。idx = 0while idx < len(your_list):&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; obj = your_list[idx]&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; print(obj.question)&nbsp; &nbsp; answer_or_help = input("Press a for Answer, h for Help, q to quit: ")&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; if answer_or_help == 'q':&nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; elif answer_or_help == "h":&nbsp; &nbsp; &nbsp; &nbsp; print(obj.hint)&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; elif answer_or_help == "a":&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;print(obj.answer)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;idx += 1 # moving object&nbsp; &nbsp; else:&nbsp; &nbsp; &nbsp; &nbsp; print("This is not a valid answer")

Answer 2

您可以使用break、continue和pass语句执行这些操作。 Break 语句 在 Python 中，break 语句为您提供了在触发外部条件时退出循环的机会。您可以将 Break 语句放在循环语句下的代码块中，通常放在条件 if 语句之后。&nbsp;number = 0for number in range(10):&nbsp; &nbsp; if number == 5:&nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; # break here&nbsp; &nbsp; print('Number is ' + str(number))print('Out of loop')continue 语句 continue 语句使您可以选择跳过触发外部条件的循环部分，但继续完成循环的其余部分。也就是说，循环的当前迭代将被打乱，但程序将返回到循环的顶部。continue 语句将位于循环语句下的代码块内，通常位于条件 if 语句之后。number = 0for number in range(10):&nbsp; &nbsp; if number == 5:&nbsp; &nbsp; &nbsp; &nbsp; continue&nbsp; &nbsp; # continue here&nbsp; &nbsp; print('Number is ' + str(number))print('Out of loop')Pass 语句 当触发外部条件时，pass 语句允许您处理该条件，而不会以任何方式影响循环；除非发生中断或其他语句，否则所有代码将继续被读取。与其他语句一样，pass 语句将位于循环语句下的代码块内，通常位于条件 if 语句之后。&nbsp; number = 0for number in range(10):&nbsp; &nbsp; if number == 5:&nbsp; &nbsp; &nbsp; &nbsp; pass&nbsp; &nbsp; # pass here&nbsp; &nbsp; print('Number is ' + str(number))print('Out of loop')

Answer 3

我将它包装在一个函数中，这样你就可以从它返回。def show_questions(questions):&nbsp; &nbsp; for item in questions:&nbsp; &nbsp; &nbsp; &nbsp; print(item.question)&nbsp; &nbsp; &nbsp; &nbsp; while True:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; user_input = input("Press a for Answer, h for Help, q to quit: ")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if user_input == 'h':&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(item.hint)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elif user_input == 'a':&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(item.answer)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; elif user_input == 'q':&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("This is not a valid answer)a请注意如何清楚地看到 Answer和h这种方式之间的区别q：h让您处于内部循环中，a中断内部循环并q通过从函数返回来中断两个循环。