New Features and Improvements in Python 3.11

Python 3.11 has been officially released, marking the latest milestone since Python 3.10 and offering a speed increase of 10‑60 % over its predecessor.

The update introduces more detailed error tracebacks with decorative annotations, helping users pinpoint the source of errors more quickly.

Execution speed is improved through the "specializing adaptive interpreter" (PEP 659) and the quickening of bytecode after a few function calls, resulting in an average 25 % performance boost in benchmarks.

Async programming receives a cleaner syntax via task groups, simplifying the creation and monitoring of concurrent tasks.

Type hinting is expanded with five new PEPs (PEP 646, 655, 673, 675, 681), adding features such as variadic generics, Self types, and data‑class conversion.

Python 3.11 adds native TOML configuration parsing through the new tomllib module, built on the third‑party toml library.

Exception handling is optimized with zero‑cost exceptions and the introduction of exception groups, reducing overhead when no exceptions are raised and providing structured handling for multiple errors.

Additional enhancements include faster program startup, import‑time measurement tools, and support for negative‑zero formatting in floating‑point calculations.

For a complete list of changes, refer to the official Python 3.11 documentation.