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["Garth N. Wells" <gnw20@xxxxxxxxx>]

How do I set a parameter for an object in PyDOLFIN? I'd like to set 
Newton solver parameters in demo/nls/nonlinearpoisson/python/demo.py. 
The code

    nonlinear_solver = NewtonSolver()
    nonlinear_solver.dolfin_set("Newton maximum iterations", 50)

leads to the error,

    return _dolfin.Parametrized_dolfin_set(*args)
TypeError: in method 'Parametrized_dolfin_set', argument 3 of type 
'std::string'

Garth