The following code runs ok from the Python Script node Editor, if you previously click on Reset Workspace. # Copy input to output from py2neo import Graph, types from pandas import DataFrame graph = Graph(host="xxxxx", bolt=True, bolt_port=7687, user="xxx", password="xxx") query = "match (h:HistClin)-[rt]-(t:ConceptoTrad)-[rc]-(c:Concepto) where toString(h.id) =~ '20180624114754.*' return h,rt,t,rc,c" result = graph.run(query).data() df = DataFrame(result) #output_table = input_table.copy() output_table = df.copy() If you run it from the Analytics Platform, or run it without resetting workspace, you get: ERROR PythonKernel LookupError: No serializer extension having the id or processing python type "py2neo.types.Node" could be found. ERROR Python Script (1⇒1) 0:556:0:618 Execute failed: An exception occured while running the python kernel. See console and log for details. So it seems to be a bug. Any workaround? Thanks

Solved: the problem is that you need to convert “node type” to something that matches a KNIME dataframe constituent types, eg. split the node attributes into several columns of type String and Int. This applies to any Graph library based in Python (including py2neo). Thanks!

Python serializer error

KNIME Analytics Platform

mlauber71 July 8, 2018, 8:56am 5

This sounds like the problem mentioned here:

I have not tried the suggested workaround.