Here is a proposed behavior available in my 1694ms branch that
converts solve to a wrapper that returns an iterator of multiset/
dictionary solutions after getting a solution from solve. I won't
start changing tests unless we can agree that this is a good step
forward.
>>> from sympy import *
>>> var('x y')
(x, y)
no solution
>>> for s in solve(3, x):
... print s
...
one eq and one sol
>>> for s in solve(x-3):
... print s
...
{x: 3}
one eq multiple solutions
>>> for s in solve(x**2-4):
... print s
...
{x: 2}
{x: -2}
multi equations
>>> xis=2;yis=3
>>> from sympy.solvers.solvers import solve, _solve
with one solution
without explicit symbols given
>>> for s in solve([x + y - (xis + yis), x - y - (xis - yis)]):
... print s
...
{x: 2, y: 3}
with explicit symbols given
>>> for s in solve([x + y - (xis + yis), x - y - (xis - yis)], y,
x):
... print s
...
{x: 2, y: 3}
with multi solutions
>>> eqs = [x**2 + y - (xis**2 + yis), x - y**2 - (xis - yis**2)]
>>> for s in solve(eqs, y, x):
... print s
...
{x: 1/2 + 29**(1/2)/2, y: 7 - (1/2 + 29**(1/2)/2)**2}
{x: -3, y: -2}
{x: 1/2 - 29**(1/2)/2, y: 7 - (1/2 - 29**(1/2)/2)**2}
{x: 2, y: 3}
check them
>>> for s in solve(eqs):
... [e.subs(s).n(3, chop=True) for e in eqs]
...
[0, 0]
[0, 0]
[0, 0]
[0, 0]
/c
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