On Tue, Dec 16, 2014 at 12:10 PM, matthieu bec <mbec@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


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