2009/4/16 Robert Kern <robert.k...@gmail.com>: > On 2009-04-16 13:42, Paul Moore wrote: >> >> 2009/4/16 Ned Deily<n...@acm.org>: >>> >>> In article >>> <b8ad139e0904152318p5473cbe5yb5f55a19894cc...@mail.gmail.com>, >>> Jess Austin<jess.aus...@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 >>>> http://codereview.appspot.com/25079. >>> >>> 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) >>>> 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) >>>> dt.months > 1 >>>> datetime(2009, 1, 31) + relativedelta(years=-1) > datetime.datetime(2008, 1, 31, 0, 0)
Yes, but given r = relativedelta(d1, d2) how do I determine the number of months between d1 and d2, and the "remainder" - what monthmod gives me. From the code, r.months looks like it works, but it's not documented, and I'm not 100% sure if it's always computed. The use case I'm thinking of is converting the difference between 2 dates into "3 years, 2 months, 5 days" or whatever. I've got an application which needs to get this right for one of the dates being 29th Feb, so I *really* get to exercise the corner cases :-) Paul _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
