How to extract coefficients from pydynpd package in python(system gmm)?

Question

I am trying to run a monte carlo simulation on a model estimated by the system gmm. Therefore, I need to extract the coefficients of my model from the prettytable from the pydynpd package in python (https://github.com/dazhwu/pydynpd). I am searching for a command/function that returns just like statsmodels with fit().params, the coefficients in an array.