+1 on a classmethod constructor +0 on a based-on-type default constructor +inf on SOMETHING!
Let's get passed the bike shedding and make this work! -CHB On Wed, Oct 25, 2017 at 2:18 PM, Alex Walters <tritium-l...@sdamon.com> wrote: > > > > -----Original Message----- > > From: Alexander Belopolsky [mailto:alexander.belopol...@gmail.com] > > Sent: Wednesday, October 25, 2017 4:33 PM > > To: Alex Walters <tritium-l...@sdamon.com> > > Cc: Elvis Pranskevichus <elpr...@gmail.com>; Python-Dev <python- > > d...@python.org>; Chris Barker <chris.bar...@noaa.gov> > > Subject: Re: [Python-Dev] iso8601 parsing > > > > On Wed, Oct 25, 2017 at 3:48 PM, Alex Walters <tritium-l...@sdamon.com> > > wrote: > > > Why make parsing ISO time special? > > > > It's not the ISO format per se that is special, but parsing of str(x). > > For all numeric types, int, float, complex and even > > fractions.Fraction, we have a roundtrip invariant T(str(x)) == x. > > Datetime types are a special kind of numbers, but they don't follow > > this established pattern. This is annoying when you deal with time > > series where it is common to have text files with a mix of dates, > > timestamps and numbers. You can write generic code to deal with ints > > and floats, but have to special-case anything time related. > > >>> repr(datetime.datetime.now()) > 'datetime.datetime(2017, 10, 25, 17, 16, 20, 973107)' > > You can already roundtrip the repr of datetime objects with eval (if you > care to do so). You get iso formatting from a method on dt objects, I > don’t see why it should be parsed by anything but a classmethod. > > > -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov
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