Question

嗨我想在python中验证一些日期。但问题是我有一个特殊范围，例如，我的日期从1/1/2014到08/07/2014。所以我的问题是我如何验证格式和价值。我查看了此链接，但它只验证格式，但不验证具体值。

import time
date = input('Date (mm/dd/yyyy): ')enter date here
try:
    valid_date = time.strptime(date, '%m/%d/%Y')
except ValueError:
    print('Invalid date!')

How can I validate a date in Python 3.x?

Answer 1

使用time.strptime()，然后验证生成的对象是否在您的范围内，而不是使用datetime.datetime.strptime()：

from datetime import datetime, date
date_input = input('Date (mm/dd/yyyy): ')
try:
    valid_date = datetime.strptime(date_input, '%m/%d/%Y').date()
    if not (date(2014, 1, 1) <= valid_date <= date(2014, 8, 7)):
        raise ValueError('Date out of range')
except ValueError:
    print('Invalid date!')

如果没有抛出异常，valid_date绑定到datetime.date() instance。

Answer 2

我想建议把它放到一个函数中：

from datetime import datetime


def validate_date(input_date, first=datetime(2014, 1, 1),
                              last=datetime(2014, 8, 7),
                              fmt='%m/%d/%Y'):
    """Return a validated datetime.datetime or None.

    If the date has the wrong format return None, or if it is not in
    the range [first,last] also return None.  Otherwise return the
    input_date as a datetime.datetime object.

    """
    try:
        d = datetime.strptime(input_date, fmt)
        if not (first <= d <= last):
            raise ValueError
    except ValueError:
        return None
    else:
        return d


# Example usage...
valid_date = validate_date(input('Date mm/dd/yyyy: '))
if valid_date is not None:
    print(valid_date)
else:
    print('Date not ok!')

Answer 3

import datetime

inputDate = input("Enter the date in format 'dd/mm/yy' : ")

day,month,year = inputDate.split('/')

isValidDate = True
try :
    datetime.datetime(int(year),int(month),int(day))
except ValueError :
    isValidDate = False

if(isValidDate) :
    print ("Input date is valid ..")
else :
    print ("Input date is not valid..")

如何在python中验证日期

3 个答案: