1. Receive data from previous n8n nodes using `_input.all()` or `_input.item`.
2. Access data elements using `.get()` method for safe dictionary access.
3. Write Python code to transform, filter, or aggregate the data.
4. Ensure the code adheres to n8n's limitations (no external libraries).
5. Structure the output as a list of dictionaries with a 'json' key.
6. Return the processed data to the next node in the workflow.