On Mon, May 23, 2011 at 4:03 PM, Chris Smith <smi...@gmail.com> wrote: > Aaron S. Meurer wrote: >> On May 22, 2011, at 9:50 AM, Chris Smith wrote: >> >>> Ronan Lamy wrote: >>>> Le dimanche 22 mai 2011 à 14:38 +0545, Chris Smith a écrit : >>>>> >>>>> I think that sets make more sense, too, but it's useful to >>>>> have the >>>>> variables in the output, and dicts are the easiest way to >>>>> handle them. >>>>> What about using sets of frozen dicts? Frozen dicts aren't >>>>> builtins >>>>> but there are simple free implementations (I just adapted >>>>> one from >>>>> http://code.activestate.com/recipes/414283/), that work in >>>>> all python >>>>> versions. They can easily be converted to/from dicts and >>>>> subs should >>>>> be able to use them directly. > ... > >> -1. Even without guessing, referencing the solutions by the symbol >> makes things easier to read and to reference programmatically. It's >> much easier to say sol[x] than to figure out what position x was in >> and call sol[i]. > > Well...then you can't have sets until the frozendict is implemented, so if > you want sets then someone's gotta give the green light to the request above > and be willing to push the commit.
I believe I misunderstood Ronan's suggestion. I thought he was suggesting to use the builtin set, not the Set class from core. I think using Set would be too much of a hassle: it's not even an iterable, so you wouldn't be able to pass it to subs or convert to a dict. I agree with Chris that solve() has very basic problems that should be addressed right now. If we are going to use builtin sets, I put my adapted version of FrozenDict here: https://gist.github.com/987629 Notice that frozen is not the same thing as hashable: all keys and values (a restriction that plain dict doesn't impose) must be hashable for that (like a tuple). If people are +1, this could go into core/containers? Renato -- 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.
