I am looking to update a feature service hosted in our organizations ArcGIS Online account by creating a spatial join on this service with another service and then field calculating a few fields in this service using Python. I can do fairly easy with feature classes or shapefiles but am unsure show to go about this with feature services in AGO. I have been researching some and haven't found exactly what I am looking for up to this point. Any assistance would be greatly appreciated. Thanks in advance.