Le samedi 21 mai 2011 à 21:50 -0500, Andy Ray Terrel a écrit : > On Sun, May 15, 2011 at 6:54 PM, Brian Granger <elliso...@gmail.com> wrote: > > On Sat, May 14, 2011 at 1:49 PM, Vinzent Steinberg > > <vinzent.steinb...@googlemail.com> wrote: > >> On 14 Mai, 18:31, Ronan Lamy <ronan.l...@gmail.com> wrote: > >>> _op_priority was designed to help with implementing arithmetic > >>> operations, particularly for things that aren't "calculus expressions" > >>> yet have meaningful __add__, __mul__, __pow__, etc. such as vectors and > >>> operators of various kinds. But it turns out that it doesn't really help > >>> (http://groups.google.com/group/sympy/browse_thread/thread/810e127bc41...) > >>> and it isn't used anywhere currently. > >>> > >>> It also has fundamental flaws that prevent it from ever evolving into a > >>> complete solution to the problem: it assumes that the priority order is > >>> the same for all operations and turns this order into a total order, > >>> introducing couplings between objects that would otherwise have no > >>> knowledge of each other. > >>> > >>> So, I think that there's little benefit in including into 0.7.0, but it > >>> would have the significant drawback of committing us to support this > >>> feature for who knows how long, and therefore of making much more > >>> difficult to refactor this critical mechanism. And if _op_priority does > >>> turn out to be useful, it can easily be added back in after the release > >>> by reverting the removal. > >> > >> If it is not used, I think we can remove it. > > > > +1 > > > > Please don't do this. I use op_priority all the time. Its the one > reason I haven't release my code because I depend on this > functionality.
You're a bit late: it's been removed already, in 041995d37563f1e0743c75a311035b553f66741e. But we could revert that commit. Can you open an issue and link to code that uses _op_priority? > In fact I was just about to mail the list about getting rid of all the > hard coded Mul and Add in the core. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
