Alan Gauld wrote: > "Kent Johnson" <[EMAIL PROTECTED]> wrote > >> Because of the ambiguities of month arithmetic (what is 2005-1-31 >> plus >> one month?) datetime refuses to guess and does not support this. > >> The third-party dateutil module is not as circumspect: >> >> In [1]: import datetime >> >> In [2]: startdate = datetime.date(2005,2,13) > > As a matter of interest what would dateutil do with > the example above?
It coerces the day to fall within the month: In [1]: import datetime In [2]: startdate = datetime.date(2005,1,31) In [3]: from dateutil.relativedelta import relativedelta In [4]: delta = relativedelta(months=+1) In [5]: startdate+delta Out[5]: datetime.date(2005, 2, 28) Details here: http://labix.org/python-dateutil#head-72c4689ec5608067d118b9143cef6bdffb6dad4e Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
