If solve is called with list containing a single variable and
solution_dict=True, the code tries to iterate over the solution, but can't
because it is not an Expression rather than a list of expressions. As an
example,
solve(x, [x], solution_dict=True)
The problem occurs at the end of _solve_expression (at line 1260 of
src/sage/symbolic/relation.py):
if solution_dict:
if isinstance(x, (list, tuple)):
X = [{sol.left():sol.right() for sol in b} for b in X]
else:
X = [dict([[sol.left(),sol.right()]]) for sol in X]
(x is what solve is requested to solve for and X is the set of solutions).
But if only a single variable is passed, each b in X is an Expression such
as x == 0, hence the for sol in b fails.
Jacob
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