Am 05.04.2022 um 10:15 schrieb Fred Engst: Well, yes and no. It is indeed possible to call Python from within a gretl/hansl script, using the same "foreign" command block like you would use for invoking R. See part III of the user guide. ("Technical details"; the same goes for Julia, Stata, Ox, Octave.) But R has a special status in that you can tell gretl to directly call into the R library, instead of starting an entire external process. This should affect mostly the startup delay. AFAIK, you cannot do this directly with Python. So, depending on what you meant by the term "library" in your question, the answer is either no or yes. cheers sven