Python：任意日期增加3周 [英] Python: Adding 3 weeks to any date

问题描述

我需要有关程序的帮助。

如何在用户可以控制日期的任何给定日期上增加3周（21天）？

I need help with a program.
How do I add 3 weeks (21 days) to any given date when the user can control the date?

用户将输入日期YYYY-MM-DD。

The user will enter the date YYYY-MM-DD.

在下面，我试图找到连字符并确保只有2个。这是到目前为止，我所要做的只是重复一遍，有人可以告诉我我哪里出了错吗？：

Below I'm trying to locate the hyphen and make sure there is only 2. This is what I have so far but all it does is repeat itself, can someone tell me where I went wrong ?:

date = raw_input("Enter date: ")
i = 0
while i <= len(date):
    if date[i] != "-":
    i = i + 1
print date

现在我要选择年，月，日。是否有更简单的方法来执行此操作，因为我需要考虑更改月份等？

Now I'm picking out year, month, day. Is there an easier way to do this cause I need to account for the change months etc ?

year = date[0:4]
month = date[5:7]
day = date[9:11]

谢谢

推荐答案

使用 datetime 模块添加到任务。您创建一个可识别日期时间的对象，并向其中添加21天的timedelta对象。

Use datetime module to the task. You create a datetime aware object and add 21 days timedelta object to it.

>>> import datetime
>>> u = datetime.datetime.strptime("2011-01-01","%Y-%m-%d")
>>> d = datetime.timedelta(days=21)
>>> t = u + d
>>> print(t)
2011-01-22 00:00:00

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