Jan Lindblad discusses and compares the NSO Python API, then walks through the code of a simple service implemented in Python. Much of the presentation is spent in a programming editor, but the slides shown in the beginning are here: NSO Developer Days Developing a Service in Python presentation
Should you want to try out these labs on your own and in your own pace, the lab packages are available here: NSO Dev Days: QoS-classifier Lab and here: NSO Dev Days: Python Reactive Fastmap Lab