Hi @moye​ ,

Thanks for your question and welcome to the Forums! While we have the ability to use ArcPy in the PythonCaller we have lots of transformers that can do many of the same processes. We generally encourage the use of the built-in transformers over scripting for most cases, for ease of debugging and sharing the workspace, though there are times where python can expand upon FME capabilities.

For the PythonCaller, we have a tutorial on Using Arcpy for FME Feature Processing that might be helpful to check out. If you're curious about other transformers, you can check out the Transformer Gallery and filter by category to explore.

What kind of formats are you working with and looking to output? Perhaps I can share some other article suggestions. Otherwise, feel free to browse the search and filter to Articles for instructional tutorials. (:

Your reply helps a lot, Thank you @jovitaatsafe​