Optimization using scipy.optimize

[Gribouillis]

So, for a given combination of a and b, I get different values of c, d, and e. The goal is to find a combination of a and b such that c, d, and e are the smallest.

This sentence implies that there is a dependency relation between a, b and the values of c, d, e. This is the missing part in your description of the problem. How do you get the values of c, d, e for a given combination of a, b?