Python 3.9.0b4 Released: New Language Features and Standard‑Library Updates
Python 3.9.0b4, the fourth beta of the upcoming 3.9 release, introduces several new language features and standard‑library updates—including PEP 584 dict union operator, PEP 585 generic types, new PEG parser, enhanced Unicode support, and various performance and security improvements—providing the community an opportunity to test and prepare for the final version.
Python 3.9.0b4 has been released. Python 3.9 is still under development, and this version 3.9.0b4 is the fourth of five planned beta previews.
The beta preview aims to give the community a chance to test new features, report bugs, and prepare projects for the upcoming final release.
Python 3.9 includes several major new features and changes:
PEP 584 adds a Union operator to the built‑in dict type.
PEP 585 introduces generic types in type annotations.
PEP 593 provides flexible function and variable annotations.
PEP 602 establishes a stable annual release cadence for Python.
PEP 615 adds support for the IANA time‑zone database in the standard library.
PEP 616 adds new string methods for removing prefixes and suffixes.
PEP 617 introduces a new PEG parser for CPython.
BPO 38379 improves garbage collection so it does not block resurrected objects.
BPO 38692 adds os.pidfd_open , enabling process management without race conditions or signals.
BPO 39926 upgrades Unicode support to version 13.0.0.
BPO 1635741 prevents memory leaks when Python is initialized multiple times in the same process.
Several built‑in functions (range, tuple, set, frozenset, list, dict) now use PEP 590 vectorcall for speed improvements.
Various built‑in modules (_abc, audioop, _bz2, _codecs, _contextvars, _crypt, _functools, _json, _locale, operator, resource, time, _weakref) now use PEP 489 multi‑phase initialization.
Some standard‑library modules (audioop, ast, grp, _hashlib, pwd, _posixsubprocess, random, select, struct, termios, zlib) now use the stable ABI defined by PEP 384.
Laravel Tech Community
Specializing in Laravel development, we continuously publish fresh content and grow alongside the elegant, stable Laravel framework.
How this landed with the community
Was this worth your time?
0 Comments
Thoughtful readers leave field notes, pushback, and hard-won operational detail here.