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Another surprise from the datetime module

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  Another surprise from the datetime module roy@panix.com (Roy Smith) - 2014-01-30 12:32 -0500
    Re: Another surprise from the datetime module Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-30 18:03 +0000
    Re: Another surprise from the datetime module Neil Cerutti <neilc@norwich.edu> - 2014-01-30 18:36 +0000

#65029 — Another surprise from the datetime module

I was astounded just now to discover that datetime.timedelta doesn't
have a replace() method (at least not in Python 2.7).  Is there some
fundamental reason why it shouldn't, or is this just an oversight?

My immediate use case was wanting to print a timedelta without the
fractions of seconds.  The most straight-forward is:

print td.replace(microseconds=0)

but that doesn't work.  Yes, I know I can use strftime, but (as I've
mentioned before :-)), that requires dragging up the reference page to
figure out what grotty little format string I need.  The brute-force

print timedelta(seconds=int(td.total_seconds()))

is easier than that, but plain old replace() would be even easier.

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#65031

On 30/01/2014 17:32, Roy Smith wrote:
> I was astounded just now to discover that datetime.timedelta doesn't
> have a replace() method (at least not in Python 2.7).  Is there some
> fundamental reason why it shouldn't, or is this just an oversight?
>
> My immediate use case was wanting to print a timedelta without the
> fractions of seconds.  The most straight-forward is:
>
> print td.replace(microseconds=0)
>
> but that doesn't work.  Yes, I know I can use strftime, but (as I've
> mentioned before :-)), that requires dragging up the reference page to
> figure out what grotty little format string I need.  The brute-force
>
> print timedelta(seconds=int(td.total_seconds()))
>
> is easier than that, but plain old replace() would be even easier.
>

datetime.timedelta doesn't have a strftime method either.

AttributeError: 'datetime.timedelta' object has no attribute 'strftime'

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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#65033

On 2014-01-30, Roy Smith <roy@panix.com> wrote:
> I was astounded just now to discover that datetime.timedelta
> doesn't have a replace() method (at least not in Python 2.7).
> Is there some fundamental reason why it shouldn't, or is this
> just an oversight?
>
> My immediate use case was wanting to print a timedelta without
> the fractions of seconds.  The most straight-forward is:
>
> print td.replace(microseconds=0)

That would be nice.

In the meantime, this works for your use case:

td -= td % timedelta(seconds=1)

-- 
Neil Cerutti

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