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From: Kushal Kumaran <kushal.kumaran@gmail.com>
To: python-list@python.org
Subject: Re: the Gravity of Python 2
In-Reply-To: <roy-D3F868.23290108012014@news.panix.com>
References: <laf00q$10k$1@ger.gmane.org> <mailman.5098.1389053970.18130.python-list@python.org> <78d91$52cbf8e9$541826b9$29485@cache1.tilbu1.nb.home.nl> <4b702$52cc262e$541826b9$22985@cache80.multikabel.net> <4cbf$52cc2e82$541826b9$11761@cache70.multikabel.net> <mailman.5141.1389114029.18130.python-list@python.org> <686$52cd4640$541826b9$21896@cache1.tilbu1.nb.home.nl> <roy-C787B2.09153508012014@news.panix.com> <mailman.5170.1389191449.18130.python-list@python.org> <laknps$umv$1@dont-email.me> <roy-B40DB1.20273008012014@news.panix.com> <mailman.5222.1389232077.18130.python-list@python.org> <roy-956F29.21255508012014@news.panix.com> <mailman.5226.1389237436.18130.python-list@python.org> <roy-76D9D0.22351408012014@news.panix.com> <mailman.5231.1389240235.18130.python-list@python.org> <roy-D3F868.23290108012014@news.panix.com>
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Date: Thu, 09 Jan 2014 11:36:29 +0530
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Roy Smith <roy@panix.com> writes:

> In article <mailman.5231.1389240235.18130.python-list@python.org>,
>  Chris Angelico <rosuav@gmail.com> wrote:
>
>> On Thu, Jan 9, 2014 at 2:35 PM, Roy Smith <roy@panix.com> wrote:
>> >> Yes, it *is* simple. It *is* easy. I've been working with pure-UTC
>> >> times (either called time_t, or TIMESTAMP WITH TIME ZONE, or even just
>> >> float) for decades. Like with so many other things, the easiest
>> >> solution is also the best, because you can just work with one stable
>> >> representation and abstraction on the inside, with conversions to/from
>> >> it at the boundaries. It IS that easy.
>> >
>> > Please show me the simple code to obtain an aware UTC datetime
>> > representing the current time.
>>=20
>> In Pike:
>> time();
>>=20
>> In PostgreSQL:
>> SELECT now();
>>=20
>> In C:
>> time(0);
>>=20
>> All of these give a value in UTC.
>
> None of which answer my question.  How, in Python, do you get an aware=20
> UTC datetime object?  I know how to get a numeric representation of the=20
> time as the number of seconds since the Unix epoch.  That's not what I=20
> asked.
>

My local copy of the python 3.2.3 docs says:

classmethod datetime.utcnow()

    Return the current UTC date and time, with tzinfo None. This is like
    now(), but returns the current UTC date and time, as a naive
    datetime object. An aware current UTC datetime can be obtained by
    calling datetime.now(timezone.utc). See also now().

Hope this helps.

>> So maybe the key is to use utcfromtimestamp()? I don't know.
>
> So, I'm really confused what point you're trying to make.  You started=20
> out arguing that I should be using aware datetimes instead of naive=20
> datetimes.  I said that the reason I don't use aware datetimes is=20
> because they're so much more difficult to generate.  You said they were=20
> simple to generate.
>
> So, I'd like to see your code which generates an aware UTC datetime=20
> object in Python.  And then we can argue about whether it's simple or=20
> not :-)

=2D-=20
regards,
kushal

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