python - 尝试添加无效/有效的输入系统

Question

print("Mathematics Quiz")
question1 = "What is the square root of 16?"
options1 = "a. 4\nb. 6\nc. 2\nd. 16\n"
options2 = "a. Chang'e\nb. Hou Yi\nc. Jing Wei\nd. Susano\n"
question2= "Who is the Chinese God of the sun?"
print(question1)
print(options1)
validinput = ("a" and "b" and "c" and "d")
# Attempts = 2 per question

while True:
    response = input("Hit 'a', 'b', 'c' or 'd' for your answer\n")
    while response is not validinput:
      print("Please use a valid input")
      break
    else:
      if response == "a":  
        print("Correct! You Got It!")
        break
      elif response == "b" or "c" or "d":
        print("Incorrect!!! Try again.")

        while True:
            response = input("Hit 'a', 'b', 'c' or 'd' for your answer\n")

            if response == validinput:
              print("Correct! You Got It!")
              stop = True
              break
            else:
                print("Incorrect!!! You ran out of your attempts!")
                stop = True
                break
        if stop:
            break

所以，这是一个简单的小测验的代码，如果我不包含有效/无效的输入部分，它就可以工作。所以我想要完成的是，如果用户输入是“a”“b”“c”或“d”以外的任何内容，那么它将返回“请使用有效的输入”并循环直到有效使用输入。我相信问题可能出在我定义“validinput”的方式上。无论出于何种原因，“a”是唯一接受的输入，而所有其他输入都使程序返回“请使用有效的输入”。无论如何，如果有人知道如何解决这个问题或完全有不同的想法，我将不胜感激。谢谢!

Answer 1

您可以将 validinput 更改为列表，然后测试该值是否不在 validinput 中。对于这种检查来说，使用生成器似乎过于复杂。

valid_input = ['a', 'b', 'c', 'd']

while True:
    response = input("Hit 'a', 'b', 'c' or 'd' for your answer\n")
    if response not in valid_input:
      print("Please use a valid input")
      continue   # re-start the main while loop
...