How to find the p,d,q values selected in auto_arima() Python?

Question

I would like to run auto_arima() on a training set and then use the same selected p,d,q values to evaluate arima() on a test set.

Answer 1

If you're talking about this auto_arima(), it apparently

returns a fitted ARIMA model

i.e. an instance of this ARIMA class.

You can then directly use that class, or if you really do need the parameters, see the get_params() method.