New submission from webograph <[EMAIL PROTECTED]>: i suggest that division be defined for timedelta1/timedelta2, in that sense that it gives how many times timedelta2 fits in timedelta1 (ie the usual meaning of division), using integer arithmetics for floor division (//) and returning float for truediv (/ after `from __future__ import division`)
use case -------- aside from the obvious how-many-times-does-a-fit-into-b, this solves the issue of having individual methods for conversion to a number of seconds, hours, days or nanocenturies (as described in #1673409). example: from datetime import timedelta duration = timedelta(hours=1.5, seconds=20) print "Until the time is up, you can listen to 'We will rock you' %d times."%(duration//timedelta(minutes=5, seconds=3)) import time time.sleep(duration/timedelta(seconds=1)) history ------- this issue follows a discussion on python-list, re-initiated by [1]. there have previously been similar feature requests on datetime, most of which have been rejected due to ambiguities (e.g. [2]), conflicts with time_t or issues with time zones. the only issue i've seen that can be relevant here is the integer-vs-float discussion, which is here handled by floordiv (//) and truediv. patch ----- i've written a patch against svn trunk revision 62520. it uses function pointers to reduce code duplication; in case this inappropriate here, i also have a pointerless version. i familiar with c but not experienced, especially with the python ways of writing c. most of the code is just adapted from other functions in the same files, so it is probably, but should nevertheless checked with special care. i've also added test, but am not sure what has to be tested and what not. compatibility ------------- only cases in which division would fail without the patch are changed. this will be a problem if (and only if) someone divides unknown objects and waits for TypeError to be raised. such behavior is probably rare. [1] <mid:[EMAIL PROTECTED]>, http://mail.python.org/pipermail/python-list/2008-April/488406.html [2] http://mail.python.org/pipermail/python-dev/2002-March/020604.html ---------- components: Library (Lib) files: datetime_datetime_division.patch keywords: patch messages: 65902 nosy: webograph severity: normal status: open title: datetime: define division timedelta/timedelta type: feature request Added file: http://bugs.python.org/file10126/datetime_datetime_division.patch __________________________________ Tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue2706> __________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
