> -----Original Message----- > From: Alexander Belopolsky [mailto:[email protected]] > Sent: Wednesday, October 25, 2017 4:33 PM > To: Alex Walters <[email protected]> > Cc: Elvis Pranskevichus <[email protected]>; Python-Dev <python- > [email protected]>; Chris Barker <[email protected]> > Subject: Re: [Python-Dev] iso8601 parsing > > On Wed, Oct 25, 2017 at 3:48 PM, Alex Walters <[email protected]> > 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. _______________________________________________ Python-Dev mailing list [email protected] https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
