年和周编号的日期时间 [英] Datetime from year and week number

问题描述

我有一个年和周的数字，我想将其转换为 datetime.datetiem 对象。我对文档的阅读（天真？）暗示 strptime（'2016 00'，'％Y％W'）应该做到这一点。但是：

I have a year and a week number which I want to convert into a datetime.datetiem object. My (naive?) reading of the documentation hinted that strptime('2016 00', '%Y %W') should do just that. However:

In [2]: from datetime import datetime

In [3]: datetime.strptime('2016 00', '%Y %W')
Out[3]: datetime(2016, 1, 1, 0, 0)

In [4]: datetime.strptime('2016 52', '%Y %W')
Out[4]: datetime(2016, 1, 1, 0, 0)

我在做什么错了？

推荐答案

所以事实证明星期数不足以让 strptime 获取日期。将默认的星期几添加到您的字符串中，这样它将起作用。

So it turns out that the week number isn't enough for strptime to get the date. Add a default day of the week to your string so it will work.

> from datetime import datetime
> myDate = "2016 51"
> datetime.strptime(myDate + ' 0', "%Y %W %w")
> datetime.datetime(2016, 12, 25, 0, 0)

0表示选择该周的星期日，但是您可以每天在0到6之间进行更改。

The 0 tells it to pick the Sunday of that week, but you can change that in the range of 0 through 6 for each day.

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