Comment #5 on issue 3560 by [email protected]: solve() is a giant mess
http://code.google.com/p/sympy/issues/detail?id=3560
"What's wrong with the dict output?"
Most arguments again dict output are detailed in the discussion linked
above.
Personally, I would sum up my own arguments as follows :
* correct mathematical type is set, and unless major drawback, it's always
better to follow closely mathematical conventions.
Using dict may lead to surprising results, like solve(x**2 = 1, x) !=
solve(y**2 = 1, y). Mathematically, it doesn't make sense IMO.
* this is probably mostly personal, but most of the time, when I solve
equations, I use only one variable, so, in practice, using sets leads to
more natural and readable code, like `for sol in solutions`, or `if 0 in
solutions` (and not `for sol in solutions.values()`...).
* if one expands sympy solving abilities, I'm afraid some fundamental
restrictions of dict may appear.
For example, solve(x**2 +y**2 < 1, (x, y)) should be the disk of radius 1
and center (0,0) ; I don't see how to represent it using a dict.
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