- prepare env for developing python on GCP, https://cloud.google.com/python/setup
- code structure, https://cloud.google.com/functions/docs/writing/#structuring_source_code
- cloud function env, https://cloud.google.com/functions/docs/concepts/exec#functions-concepts-stateless-python
- app engine for python, https://cloud.google.com/python/quickstarts
- hello world in app engine, https://cloud.google.com/python/getting-started/hello-world