Yes I can. The attached workflow uses Python Random Forest Learner, stores the model as Pickle file and reads it again.
The structure with Object Writer is mainly there to follow a common KNIME structure. Technically it also does work to just do everything within a Python Script node.
Not sure about jython in that context. Pickle could be written as binary (“wb” write binary).
kn_example_python_census_income.knar (1.4 MB)