[Python-Dev] Issue5434: datetime.monthdelta
robert.kern at gmail.com
Thu Apr 16 22:10:15 CEST 2009
On 2009-04-16 13:42, Paul Moore wrote:
> 2009/4/16 Ned Deily<nad at acm.org>:
>> In article
>> <b8ad139e0904152318p5473cbe5yb5f55a19894cc834 at mail.gmail.com>,
>> Jess Austin<jess.austin at gmail.com> wrote:
>>> I'm new to python core development, and I've been advised to write to
>>> python-dev concerning a feature/patch I've placed at
>>> http://bugs.python.org/issue5434, with Rietveld at
>> Without having looked at the code, I wonder whether you've looked at
>> python-dateutil. I believe its relativedelta type does what you
>> propose, plus much more, and it has the advantage of being widely used
>> and tested.
> The key thing missing (I believe) from dateutil is any equivalent of monthmod.
> Hmm, it might be possible via relativedelta(d1,d2), but it's not clear
> to me from the documentation precisely what attributes/methods of a
> relativedelta object are valid for getting data *out* of it.
I thought the examples were quite clear. relativedelta() has an alternate
constructor precisely suited to these calculations but is general and handles
more than just months.
>>> from dateutil.relativedelta import *
>>> dt = relativedelta(months=1)
>>> from datetime import datetime
>>> datetime(2009, 1, 15) + dt
datetime.datetime(2009, 2, 15, 0, 0)
>>> datetime(2009, 1, 31) + dt
datetime.datetime(2009, 2, 28, 0, 0)
>>> datetime(2009, 1, 31) + relativedelta(years=-1)
datetime.datetime(2008, 1, 31, 0, 0)
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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