I have a table that I need to export to an Excel file. To this file I want to apply some styling. I’ve written a Python script that works well: it uses a FeatureWriter followed by a PythonCaller, and the result is an Excel file with the desired formatting, including filters, colors, and so on.

Now I’d like to split this Excel output using a fanout expression, which generates 23 separate Excel files. Each of these files should then be processed by the PythonCaller. However, that’s where things go wrong — the process seems to get stuck. I’m using the _dataset variable from the Summary output port of the FeatureWriter as the location for the Excel files, which the PythonCaller should loop through.

Is there something I might have overlooked?