Python：每小时迭代两次日期时间 [英] Python: iterate through two datetimes hourly

问题描述

这里是问题：

使用python的datetime模块，创建一个迭代器，该迭代器生成两个datetime.datatime对象之间的所有小时。

Using python's datetime module, create an iterator that generates all the hours between two datetime.datatime objects.

it = hourly_it（d1，d2）＃其中 d1 和 d2 是 datetime.datetime 对象。
例如，

it = hourly_it( d1, d2) # where d1 and d2 are datetime.datetime objects. For example,

from datetime import datetime
it = hourly_it( datetime(2018, 10, 2, 12), datetime(2018, 10, 3, 12))

将生成所有日期时间在11月3日中午12:00（至11月3日中午12:00）之间。

will generates all the date times between 12:00 (noon) Novermber 2, to 12:00 (noon) November 3rd.

这是我的代码：

from datetime import date, timedelta as td, datetime
   def hourly_it( d1, d2) :
      start = d1
      finish = d2
      def f():
         nonlocal start, finish
         if(start>=finish): return None
         start += td(hours=1)
         return start   
      return f

当我使用以下代码测试代码时：

when I test the code using:

from datetime import datetime
  it = hourly_it( datetime(2018, 10, 2, 12), datetime(2018, 10, 3,12))
  print(next(it))

我收到此错误：

TypeError追溯（最近一次通话
最后一次）

TypeError Traceback (most recent call last)

in（）
1 from datetime import datetime
2 it = hourly_it（datetime（2018 ，10，2，12），datetime（2018，10，3，12））

in () 1 from datetime import datetime 2 it = hourly_it( datetime(2018, 10, 2, 12), datetime(2018, 10, 3, 12))

----> 3 print（next（it））

----> 3 print(next(it))

TypeError：'function'对象不是迭代器

TypeError: 'function' object is not an iterator

我知道了。谢谢大家这是不使用生成器的情况下的操作方法。我还应注意，我将+1小时放在返回值之前，并将起始时间> =

I figured it out. Thanks all. Here is how you do it without using the generator. I should also note that I put the +1hour before the return and set the start >=

from datetime import date, timedelta as td, datetime
  def hourly_it( d1, d2) :
     start = d1
     finish = d2
     def f():
          nonlocal start, finish
          if(start>=finish): return None
          start += td(hours=1)
          return start

      return iter(f,None)

推荐答案

我几乎确定这是学校的作业。

I'm almost sure this is school work you got there.

但是，我将为您提供有关python迭代器协议的一些阅读信息，并且简短易懂的示例也许可以理解；

But I'll give you some reading on python's iterator protocol, and short and sweet example maybe you get it; and its not rocket science anyway.

迭代器协议： For循环如何在Python中工作

>>> from datetime import datetime, timedelta
>>> def hourly_it(start, finish):
...     while finish > start:
...             start = start + timedelta(hours=1)
...             yield start
>>> start = datetime(2018, 10, 2, 12)
>>> finish = datetime(2018, 10, 3, 12)
>>> for hour in hourly_it(start, finish):
...     print(hour)
...
2018-10-02 13:00:00
2018-10-02 14:00:00
2018-10-02 15:00:00
2018-10-02 16:00:00
2018-10-02 17:00:00
2018-10-02 18:00:00
2018-10-02 19:00:00
2018-10-02 20:00:00
2018-10-02 21:00:00
2018-10-02 22:00:00
2018-10-02 23:00:00
2018-10-03 00:00:00
2018-10-03 01:00:00
2018-10-03 02:00:00
2018-10-03 03:00:00
2018-10-03 04:00:00
2018-10-03 05:00:00
2018-10-03 06:00:00
2018-10-03 07:00:00
2018-10-03 08:00:00
2018-10-03 09:00:00
2018-10-03 10:00:00
2018-10-03 11:00:00
2018-10-03 12:00:00

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