python add array of hours to datetime

Question

import timedelta as td I have a date time and I want to add an array of hours to it.

i.e.

Date[0]
datetime.datetime(2011, 1, 1, 0, 0)

Date[0] + td(hours=9)
datetime.datetime(2011, 1, 1, 9, 0)

hrs = [1,2,3,4]
Date[0] + td(hours=hrs)

But obviously it is not supported.

Date array above is a giant array of size 100X1 and I want to add hrs = [1,2,3,4] to each row of Date to get a datetime array of size 100x4. So, a for loop is not going to work in my case.

why isn't a for loop going to work?..

Sayse
– Sayse

2016-09-26 20:02:45 +00:00
Commented Sep 26, 2016 at 20:02 — Sayse
– Sayse, Commented Sep 26, 2016 at 20:02

alecxe · Accepted Answer · 2016-09-26 20:02:55Z

2

Use a nested list comprehension and .replace() method. Sample for a list with 2 datetimes:

In [1]: from datetime import datetime

In [2]: l = [datetime(2011, 1, 1, 0, 0), datetime(2012, 1, 1, 0, 0)]

In [3]: hours = [1, 2, 3, 4]

In [4]: [[item.replace(hour=hour) for hour in hours] for item in l]
Out[4]: 
[[datetime.datetime(2011, 1, 1, 1, 0),
  datetime.datetime(2011, 1, 1, 2, 0),
  datetime.datetime(2011, 1, 1, 3, 0),
  datetime.datetime(2011, 1, 1, 4, 0)],
 [datetime.datetime(2012, 1, 1, 1, 0),
  datetime.datetime(2012, 1, 1, 2, 0),
  datetime.datetime(2012, 1, 1, 3, 0),
  datetime.datetime(2012, 1, 1, 4, 0)]]

As a result a 2x4 list of lists.

answered Sep 26, 2016 at 20:02

alecxe

476k127 gold badges1.1k silver badges1.2k bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

python add array of hours to datetime

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related