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Format a timedelta object

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  Format a timedelta object Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-26 15:16 +1000
    Re: Format a timedelta object Zachary Ware <zachary.ware+pylist@gmail.com> - 2016-05-26 00:28 -0500
      Re: Format a timedelta object Steven D'Aprano <steve@pearwood.info> - 2016-05-28 02:21 +1000
        Re: Format a timedelta object Zachary Ware <zachary.ware+pylist@gmail.com> - 2016-05-27 11:34 -0500
        Re: Format a timedelta object Pete Forman <petef4+usenet@gmail.com> - 2016-05-27 21:41 +0100
    Re: Format a timedelta object Marko Rauhamaa <marko@pacujo.net> - 2016-05-26 08:43 +0300

#109130 — Format a timedelta object

I have a timedelta object, and I want to display it in a nice human-readable 
format like 03:45:17 for "three hours, forty five minutes, 17 seconds".

Is there a standard way to do this?



-- 
Steve

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#109131

On Thu, May 26, 2016 at 12:16 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> I have a timedelta object, and I want to display it in a nice human-readable
> format like 03:45:17 for "three hours, forty five minutes, 17 seconds".
>
> Is there a standard way to do this?

   >>> timedelta(100)
   datetime.timedelta(100)
   >>> str(timedelta(seconds=100))
   '0:01:40'
   >>> str(timedelta(hours=100))
   '4 days, 4:00:00'

(I recently spent *way* too long trying to figure out how to properly
format the thing before being reminded that a plain str call gives
exactly what I was after.)

-- 
Zach

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#109179

On Thu, 26 May 2016 03:28 pm, Zachary Ware wrote:

> On Thu, May 26, 2016 at 12:16 AM, Steven D'Aprano
> <steve+comp.lang.python@pearwood.info> wrote:
>> I have a timedelta object, and I want to display it in a nice
>> human-readable format like 03:45:17 for "three hours, forty five minutes,
>> 17 seconds".
>>
>> Is there a standard way to do this?
> 
>    >>> timedelta(100)
>    datetime.timedelta(100)
>    >>> str(timedelta(seconds=100))
>    '0:01:40'
>    >>> str(timedelta(hours=100))
>    '4 days, 4:00:00'
> 
> (I recently spent *way* too long trying to figure out how to properly
> format the thing before being reminded that a plain str call gives
> exactly what I was after.)

Thanks Zach. Unfortunately, the format is not quite how I want it, so I
guess I'll have to extract the H:M:S fields manually from the seconds.



-- 
Steven

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#109180

On Fri, May 27, 2016 at 11:21 AM, Steven D'Aprano <steve@pearwood.info> wrote:
> On Thu, 26 May 2016 03:28 pm, Zachary Ware wrote:
>> On Thu, May 26, 2016 at 12:16 AM, Steven D'Aprano
>> <steve+comp.lang.python@pearwood.info> wrote:
>>> I have a timedelta object, and I want to display it in a nice
>>> human-readable format like 03:45:17 for "three hours, forty five minutes,
>>> 17 seconds".
>>
>>    >>> str(timedelta(seconds=100))
>>    '0:01:40'
>
> Thanks Zach. Unfortunately, the format is not quite how I want it, so I
> guess I'll have to extract the H:M:S fields manually from the seconds.

What's missing the mark, no leading 0 on the hour, or the extra 0 hour
specification?

Yes, unfortunately it looks like manual extraction is your only option
for that.  I'd support an RFE for a strftime-like __format__ method on
timedelta that only supported certain %-codes, though.  I haven't
checked to see if there's already an open issue.

-- 
Zach

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#109182

Steven D'Aprano <steve@pearwood.info> writes:

> On Thu, 26 May 2016 03:28 pm, Zachary Ware wrote:
>
>> On Thu, May 26, 2016 at 12:16 AM, Steven D'Aprano
>> <steve+comp.lang.python@pearwood.info> wrote:
>>> I have a timedelta object, and I want to display it in a nice
>>> human-readable format like 03:45:17 for "three hours, forty five minutes,
>>> 17 seconds".
>>>
>>> Is there a standard way to do this?
>>
>>    >>> timedelta(100)
>>    datetime.timedelta(100)
>>    >>> str(timedelta(seconds=100))
>>    '0:01:40'
>>    >>> str(timedelta(hours=100))
>>    '4 days, 4:00:00'
>>
>> (I recently spent *way* too long trying to figure out how to properly
>> format the thing before being reminded that a plain str call gives
>> exactly what I was after.)
>
> Thanks Zach. Unfortunately, the format is not quite how I want it, so I
> guess I'll have to extract the H:M:S fields manually from the seconds.

It might be useful if timedelta were to get an isoformat() method. ISO
8601 specifies formats for durations; most people are familiar only with
the date amd time formats. There are variations available but PnDTnHnMnS
is probably the best. The biggest timedelta unit is days. Years and
months are not appropriate.

-- 
Pete Forman

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#109132

Steven D'Aprano <steve+comp.lang.python@pearwood.info>:

> I have a timedelta object, and I want to display it in a nice
> human-readable format like 03:45:17 for "three hours, forty five
> minutes, 17 seconds".
>
> Is there a standard way to do this?

   >>> import datetime
   >>> td = datetime.timedelta(hours=3, minutes=45, seconds=17)
   >>> d = datetime.datetime(2000, 1, 1)
   >>> (d + td).strftime("%T")
   '03:45:17'
   >>> "%02d:%02d:%02d" % (
   ...     td.seconds // 3600, td.seconds % 3600 // 60, td.seconds % 60)
   '03:45:17'

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