smartapp-sdk is a Python library to build a webhook-based SmartApp for the SmartThings platform.
The SDK is intended to be easy to use no matter how you choose to structure your code, whether that's a traditional Python webapp (such as FastAPI on Uvicorn) or a serverless application (such as AWS Lambda).
The SDK handles all the mechanics of the webhook lifecycle interface on your behalf. You just implement a single endpoint to accept the SmartApp webhook requests, and a single callback class where you define specialized behavior for the webhook events. A clean attrs object interface is exposed for use by your callback.
SDK documentation is found at smartapp-sdk.readthedocs.io. Look there for installation instructions, the class model documentation, and example code. The smartapp-sensortrack repo on GitHub is also a good example of how to use this SDK to build a traditional Python webapp.
Developer documentation for the smartapp-sdk repo is found in DEVELOPER.md. See that file for notes about how the code is structured, how to set up a development environment, etc.