On Mar 15, 7:26 pm, Chris Rebert <c...@rebertia.com> wrote: > [...] the point is that there are likewise reasonable usecases > for the other behaviors too and one should refuse to guess in > the face of ambiguity; the std lib has, merely by default in > this case, taken this to the extreme of not implementing any > of them directly. > > Somewhat unrelated wish: if only dateutil were in the std > lib... Alas!
dateutil makes a very clear choice about the behavior of month arithmetic (namely, the one which the OP was after). Has it not "guessed in the face of ambiguity"? Personally, I don't think OP's original phrasing of the problem was too ambiguous. I agree there are other reasonable interpretations, but I disagree that his intention was unclear. His intention matches what I believe to be the prevailing one; thus I don't find dateutil's choice to be much of a guess. John -- http://mail.python.org/mailman/listinfo/python-list
