[Python-Dev] iso8601 parsing (original) (raw)

Alex Walters tritium-list at sdamon.com
Wed Oct 25 17🔞08 EDT 2017

-----Original Message----- From: Alexander Belopolsky [mailto:alexander.belopolsky at gmail.com] Sent: Wednesday, October 25, 2017 4:33 PM To: Alex Walters <tritium-list at sdamon.com> Cc: Elvis Pranskevichus <elprans at gmail.com>; Python-Dev <python-_ _dev at python.org>; Chris Barker <chris.barker at noaa.gov> Subject: Re: [Python-Dev] iso8601 parsing

On Wed, Oct 25, 2017 at 3:48 PM, Alex Walters <tritium-list at 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.

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