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Not sure what exactly you are going to do with the state estimation. If you are talking only about the steady-state, then you don't need access the DSTATE. If you don't have to access the variables related to dynamic simulation, in my opinion, you can use Python and it shall be easier to you as you are familiar with it.

However, if you have to access the variables and/or the arrays related to dynamic simulation, then it is better to use Fortran. Python can be used access some of the variables in PSS/E, however, it is very limited to the arrays used in the dynamic simulation.