我如何让它再次询问输入的年级是否超出最大值和最小值

Question

year = int(input("what year are you in?"))     

while (year) <MIN_YEAR or (year) > MAX_YEAR or not year.isalpha():
    print("Thats not within Carmels Year levels please try again


    year = int(input("what year are you     in?"))

Answer 1

year = input("what year are you in?")
min_year, max_year = 2009, 2020
while not (year.isdigit() and min_year < int(year) < max_year):
    year = input("That's not within Carmels Year levels please try again:")
else:
    year = int(year)

print(year)

Answer 2

你所拥有的大部分是正确的：你只是有一个无关紧要的错误尝试调用year.isalpha （此时year已经是int ，而不是str ）：

year = int(input("what year are you in?"))     

while (year) <MIN_YEAR or (year) > MAX_YEAR:
    print("Thats not within Carmels Year levels please try again")
    year = int(input("what year are you     in?"))

使用break语句切换到无限循环以避免重复调用input 。

while True:
    year = int(input("What year are you in?"))
    if MIN_YEAR <= year <= MAX_YEAR:
        break
    print("Thats not within Carmels Year levels please try again")

现在我们只有一次调用input和int ，我们可以更轻松地添加一些额外的错误检查。 如果你无论如何都要调用int ，让它检查输入是否为数字作为其正常功能的一部分。

while True:
    year = input("What year are you in?")
    try:
        year = int(year)
    except ValueError:
        print("Not a valid year")
        continue

    if MIN_YEAR <= year <= MAX_YEAR:
        break
    print("Thats not within Carmels Year levels please try again")

Answer 3

您可能会执行类似于以下代码片段的操作。

MIN_YEAR = 1900
MAX_YEAR = 2525

def get_year():
    year = 1900
    
    while True:
        yr = input('What year are you in: ')
    
        if not yr.isnumeric():
            print('Please only enter numbers')
            continue
            
        if int(yr) < MIN_YEAR or int(yr) > MAX_YEAR:
            print('Entry must be in the range of ', MIN_YEAR, ' to ', MAX_YEAR)
            continue
            
        break
        
    return yr
    
year = get_year()

print('Entered year is :', year)

Answer 4

改用 while True 循环，并使用 break 关键字退出循环

while True:
    year = int(input("what year are you in?"))
    min = 2000
    max = 2010
    while not (min < year < max_year):
        print("That's not within Carmels Year levels please try again:")
    else:
       break