[Python-Dev] datetime nanosecond support (ctd?)

[Alexander Belopolsky]

On Tue, Dec 16, 2014 at 12:10 PM, matthieu bec <mbec at gmto.org> wrote:

> I wonder if the datetime module is really the right location, that has
> constructor(year, month, day, ..., second, microsecond) - with 0<ms<999999,
> no millis. adding 0<ns<999 would seem quite ugly, in fact nothing looks
> quite right.


We can make nanosecond a keyword-only argument, so that

time(1, 2, 3, nanosecond=123456789) -> 01:02:03.123456789

and

time(1, 2, 3, 4, nanosecond=123456789) -> error

Users will probably be encouraged to avoid positional form when specifying
time to subsecond precision.  I would say  time(1, 2, 3, microsecond=4) is
clearer than time(1, 2, 3, 4) anyways.

Another option is to allow float for the "second" argument:

time(1, 2, 3.123456789) -> 01:02:03.123456789
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