As part of an idea to add constraints to differential_evolution I'd like to add an `is_feasible` and `violated_excess` method to `optimize._constaints.PreparedConstraint`. The `is_feasible` method would return the truth of whether a given solution satisfies the constraint. The `violated_excess` method would give the total amount that the constraint is violated by; for example if ub=[5, 6] and the constraint evaluates to [5.5, 10], then the total excess would be 4.5. I fully appreciate that `violated_excess` is a silly name, and welcome suggestions for an alternative. -- _____________________________________ Dr. Andrew Nelson _____________________________________