如何在while循环中使用while循环

Question

如果有人没有输入“y”或“n”，我该如何做到这一点，以便在我的 while 循环中可以有一个 while 循环？ 有人可以将它放入我的代码中吗？

redo = False

outstanding = 0
satisfactory = 0
unsatisfactory = 0
mark_Total = 0
value = False
while not redo:
    try:
        mark = input("Enter a mark from 0-100")
        if mark < 0 or mark >= 100:
            raise ValueError("Invalid Input")
        elif mark >= 90:
            outstanding += 1
            mark_Total += 1
            again = raw_input("Do you want to enter another mark? (y/n)")
            if again.lower() == "n":
                redo = True

Answer 1

在另一个循环中使用while循环有什么特别之处。

    elif mark >= 90:
        outstanding += 1
        mark_Total += 1
        again = 'x'
        while again != 'y' and again != 'n':
            again = raw_input("Do you want to enter another mark? (y/n)").lower()
        if again == "y":
            redo = True