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Get index of a set constraint

Using SageMath I'm trying to implement a method for the solution of a problem where I in an iterative way add a set of constraints, try to solve the problem to check if exist a solution, if not i remove the constraints and restart.

 try:
    p.solve()           
 except RuntimeError:
    p.remove_constraint(index)

Given a set of constraint that I add, how to get their indexes so that I can remove them?