Pendulum – Python datetimes made easy • Hacker News Board

Re: Pendulum – Python datetimes made easy

#11

Post by antar » Wed, Aug 17, 2016, 2:56 AM UTC

ak217 wrote: post #10

josefdlange wrote: post #7

What benefits does this have over [Delorean]( http://delorean.readthedocs.io/en/latest/ )? The README for Pendulum seems to show me one feature Delorean doesn't explicitly have -- `is_weekend()` -- otherwise these libraries are conceptually very similar. I do agree that this (and Delorean) is a usability improvement over `datetime` and perhaps even Arrow (though I'm not tremendously familiar with Arrow).

So far I haven't seen either of these libraries do substantially better than datetime+dateutil+pytz at anything they claim to be good at.

arrow.get(value).humanize()

How can I do this with datetime+dateutil+pytz?

Re: Pendulum – Python datetimes made easy

#12

Post by antar » Wed, Aug 17, 2016, 2:59 AM UTC

sdispater wrote: post #2

Pendulum is a new library for Python to ease datetimes, timedeltas and timezones manipulation. It is heavily inspired by [Carbon]( http://carbon.nesbot.com ) for PHP. Basically, the Pendulum class is a replacement for the native datetime one with some useful and intuitive methods, the Interval class is intended to be a better time delta class and, finally, the Period class is a datetime-aware timedelta. Timezones are…

Why not submit fixes for the existing library instead?

Re: Pendulum – Python datetimes made easy

#13

Post by fastball » Wed, Aug 17, 2016, 3:10 AM UTC

Looks clean.

I think the `in_words()` function should probably be delimited by commas though, good to have your strings easily deconstructed into their constituent parts.

Re: Pendulum – Python datetimes made easy

#14

Post by fastball » Wed, Aug 17, 2016, 3:10 AM UTC

Looks clean.

I think the `in_words()` function should probably be delimited by commas though, good to have your strings easily deconstructed into their constituent parts.

Re: Pendulum – Python datetimes made easy

#15

Post by detaro » Wed, Aug 17, 2016, 3:19 AM UTC

antar wrote: post #12

sdispater wrote: post #2

Pendulum is a new library for Python to ease datetimes, timedeltas and timezones manipulation. It is heavily inspired by [Carbon]( http://carbon.nesbot.com ) for PHP. Basically, the Pendulum class is a replacement for the native datetime one with some useful and intuitive methods, the Interval class is intended to be a better time delta class and, finally, the Period class is a datetime-aware timedelta. Timezones are…

Why not submit fixes for the existing library instead?

Can't talk about the specific complaints the author has, but there are a bunch of datetime libraries for python with often intentionally different behaviors. Submitting "fixes" requires the other libraries' authors to see what you want to fix as a defect and not a design decision/feature/to irrelevant to justify breaking changes.

At least that was my impression from trying to find a combination of libraries I like and reading various bug trackers in the process. In the end I pick and choose the pieces that do what I like for each part of the process, luckily the datatypes are mostly compatible or easily adapted.

Re: Pendulum – Python datetimes made easy

#16

Post by sdispater » Wed, Aug 17, 2016, 3:26 AM UTC

josefdlange wrote: post #7

What benefits does this have over [Delorean]( http://delorean.readthedocs.io/en/latest/ )? The README for Pendulum seems to show me one feature Delorean doesn't explicitly have -- `is_weekend()` -- otherwise these libraries are conceptually very similar. I do agree that this (and Delorean) is a usability improvement over `datetime` and perhaps even Arrow (though I'm not tremendously familiar with Arrow).

Mainly, its API which tries to be as close as possible as the one provided by the standard datetime library while providing a bunch of helpful methods.

Also, Pendulum is not just about datetimes but also provides both the Interval class and Period class which are improvements over the native timedelta class.

And finally, it handles properly time shifting around DST transition times and normalization of datetimes when creating them which neither Delorean nor Arrow do well.

Re: Pendulum – Python datetimes made easy

#17

Post by sdispater » Wed, Aug 17, 2016, 3:29 AM UTC

antar wrote: post #12

sdispater wrote: post #2

Pendulum is a new library for Python to ease datetimes, timedeltas and timezones manipulation. It is heavily inspired by [Carbon]( http://carbon.nesbot.com ) for PHP. Basically, the Pendulum class is a replacement for the native datetime one with some useful and intuitive methods, the Interval class is intended to be a better time delta class and, finally, the Period class is a datetime-aware timedelta. Timezones are…

Why not submit fixes for the existing library instead?

Simply because I do not really like the API of the existing libraries (Arrow or Delorean) and I just can't fix the design decisions made by the authors.

Re: Pendulum – Python datetimes made easy

#18

Post by was_boring » Wed, Aug 17, 2016, 3:32 AM UTC

sdispater wrote: post #2

Pendulum is a new library for Python to ease datetimes, timedeltas and timezones manipulation. It is heavily inspired by [Carbon]( http://carbon.nesbot.com ) for PHP. Basically, the Pendulum class is a replacement for the native datetime one with some useful and intuitive methods, the Interval class is intended to be a better time delta class and, finally, the Period class is a datetime-aware timedelta. Timezones are…

Good, because arrow is effectively dead at this point

Re: Pendulum – Python datetimes made easy

#19

Post by ak217 » Wed, Aug 17, 2016, 3:39 AM UTC

antar wrote: post #11

ak217 wrote: post #10

Earlier quoted context omitted.

So far I haven't seen either of these libraries do substantially better than datetime+dateutil+pytz at anything they claim to be good at.

arrow.get(value).humanize() How can I do this with datetime+dateutil+pytz?

I was talking about delorean and pendulum (I think josefdlange edited his comment). I agree that arrow's multi-locale natural language renderer does add a lot of value. (Although I'd argue it should be unbundled into its own module, instead of Arrow trying to replace a ton of datetime/dateutil functionality.)

Re: Pendulum – Python datetimes made easy

#20

Post by d0mine » Wed, Aug 17, 2016, 3:42 AM UTC

forgotpwtomain wrote: post #3

Python stdlib datetime/time/calendar libs are junk. That one constantly has to read obscure function signatures in the docs to do rather obvious things is just awful. On the otherhand if you've e.g. Ruby/Rails datetime handling than you get used to reasonable things working ( such as Time.now + 1.day ) that Arrow doesn't handle well. As a matter of fact Arrow got rid of DT deltas and seemingly made the situation wors…

Does Time.now + 1.day return the time 24 hours into the future or does it return the same time (hour:minutes) but the next date? (it may be more or less than 24 hours from now if the UTC offset has changed for any reason e.g., due a DST transition). How do you express these different cases in Ruby explicitly?