Marc-Andre Lemburg added the comment:
On 05.11.2013 21:31, STINNER Victor wrote:
>
> 2013/11/5 Alexander Belopolsky <rep...@bugs.python.org>:
>> +1 on adding an option to isoformat(). We already have an optional <sep>
>> argument, so the symmetry with __str__ is not complete. To make this option
>> more useful, rather than implementing always_emit_microseconds=False flag, I
>> would add a keyword argument 'precision' that would take
>> ('hour'|'minute'|'second'|millisecond'|'microsecond') value.
>
> Hour precision is not part of the ISO 8601 standard.
>
> "resolution" is maybe a better name for the new parameter than "precision":
> http://www.python.org/dev/peps/pep-0418/#glossary
>
> The new parameter should be added to datetime.datetime.isoformat() but
> also datetime.time.isoformat().
Since this ticket is about being able to remove the seconds fraction
part, I think it's better to use a name that is not already overloaded
with other meanings, e.g. show_us=False or show_microseconds=False.
BTW: Have you thought about the rounding/truncation issues
associated with not showing microseconds ?
A safe bet is truncation, but this can lead to inaccuracies of
up to a second. Rounding is difficult, since it can lead to
a "60" second value showing up for e.g. 11:00:59.95 seconds,
or the need to return "12:00:00" for 11:59:59.95.
----------
nosy: +lemburg
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<http://bugs.python.org/issue19475>
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