Irit Katriel

The next version of Python emits a SyntaxWarning when `return` is used in a `finally` block. This is a small change to the language, with an interesting history. This talk tells that story.

Over the last couple of years, CPython's compiler was refactored. In version 3.13, we will have access from Python scripts to more of the compilation stages: Instead of the old 4-stage pipeline (source --> tokens --> AST --> code object), we will have a more refined pipeline (source --> tokens --> AST --> optimized AST --> pseudo bytecode --> optimized pseudo bytecode --> bytecode --> code...

Python 3.11 introduces new features that make it possible to raise and handle multiple unrelated exceptions. This talk briefly covers what they do and how they work, and answers a frequently asked question: why we needed to add new language syntax to handle exception groups.

The Quartz engineering team at Bank of America hosts one of the world's largest python codebases. Changes in core components of the platform can have high impact.