Question

我正在尝试处理用户的错误输入，例如浮点数和长度低于4且高于4的整数，这样无论何时发生，我都要求用户重新输入4位数。

预期结果。

>>> beginning = input('Enter date: ')
>>> Enter date: 1985.0
>>> Please give a four digit integer for date.
>>> Enter date: 19.8
>>> Please give a four digit integer for date.
>>> Enter date: blabla
>>> Please give a four digit integer for date.
>>> Enter date: 200
>>> Please give a four digit integer for date.
>>> Enter date: 20000
>>> Please give a four digit integer for date.
>>> Enter date: 1980
>>> # This is good

这是我的尝试。

def reading_ans():
    while True:
        try:
            ans = input('Enter date: ')
        if float(ans) != float(int(float((ans)))):
            print("Please give a four digit integer for date.")
        elif len(ans) != 4:
            print("Please give a four digit integer for date.")
        else:
            return ans

Answer 1

如果ans.isdigit()仅由数字组成，我建议您的条件使用True仅ans的事实。

def reading_ans():
    while True:
        ans = input('Enter date: ')
        if len(ans) == 4 and ans.isdigit():
            return ans
        print("Please give a four digit integer for date.")

处理错误的用户输入，例如浮点数和数字长度

1 个答案: