如何在while循環中使用while循環

Question

如果有人沒有輸入“y”或“n”，我該如何做到這一點，以便在我的 while 循環中可以有一個 while 循環？ 有人可以將它放入我的代碼中嗎？

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

在另一個循環中使用while循環有什么特別之處。

    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