Boto 3 is a ground-up rewrite of Boto. It uses a data-driven approach to generate classes at runtime from JSON description files that are shared between SDKs in various languages. This includes descriptions for a high level, object oriented interface similar to those available in previous versions of Boto.
Because Boto 3 is generated from these shared JSON files, we get fast updates to the latest services and features and a consistent API across services. Community contributions to JSON description files in other SDKs also benefit Boto 3, just as contributions to Boto 3 benefit the other SDKs.
Boto 3 consists of the following major features:
Along with these major features, Boto 3 also provides sessions and per-session credentials & configuration, as well as basic components like authentication, parameter & response handling, an event system for customizations and logic to retry failed requests.