Python 3.11 Stable Release: Major New Features and Changes
Python 3.11 has been officially released, introducing a range of new language features such as fine‑grained error locations, exception groups, built‑in TOML parsing, asyncio task groups, enhanced regular expressions, significant performance gains, and numerous typing improvements like Self types and variadic generics.
Python 3.11 stable version has been officially released, bringing several important new features and changes to the language.
General changes include:
PEP 657 – fine‑grained error locations in tracebacks.
PEP 654 – Exception Groups and the except* syntax.
PEP 680 – tomllib for parsing TOML files in the standard library.
Asyncio now supports task groups (bpo‑46752).
Regular expressions gain atomic grouping ((?>...)) and possessive quantifiers *+, ++, ?+, {m,n}+ (bpo‑433030).
The Faster CPython project reports Python 3.11 runs 10%–60% faster than Python 3.10.
Typing changes include:
PEP 673 – introduction of the Self type.
PEP 655 – ability to mark individual TypedDict items as required or possibly missing.
PEP 675 – arbitrary string literal type.
PEP 681 – dataclass transformations.
PEP 646 – variadic generics for flexible type parameters.
These updates enhance both developer productivity and runtime performance, making Python 3.11 a significant step forward for the language.
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