Newest Python Enhancement Proposals (PEPs): Information on new language features and some meta-information like release procedure and schedules.
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This PEP proposes adding two new builtin functions, public() and private(), which document the public interface of a module by keeping its __all__ synchronized with the names actually defined to be public in that module. Both are used as decorators (@public and @private) on class and function definitions, so that a name’s visibility is declared exactly once, at the point where the name is defined.…
This PEP proposes an export statement that modules can use to express intent about the visibility of variables from outside the module.
This PEP proposes frozen display syntax: f{1, 2, 3} evaluates to a frozenset, and f{'a': 1} evaluates to a frozendict. Because immutability is guaranteed by the syntax itself rather than inferred from usage, the compiler can treat frozen displays as first-class citizens of its optimization pipeline: constant displays are folded into a single LOAD_CONST with an exact result type at compile time and…
There is a long-standing inconsistency in the way variable names are resolved in classes. Several alternatives to resolve this inconsistency are discussed.
Add two builder (“writer”) C APIs, PyFrozenSetWriter and PyFrozenDictWriter, following the design of PyBytesWriter (PEP 782). A writer collects items internally; *_Finish() produces the immutable object — a frozenset or a frozendict (PEP 814) — in a single pass, without ever exposing a mutable intermediate object.
This PEP proposes adding a python-version field to pyvenv.cfg which records the Python interpreter used by a virtual environment. It records only the major and minor version to be resilient to patch version updates.
This PEP adds an extension mechanism to the json encoder consisting of three complementary parts, one per level of customization:
The experimental Just-in-Time (JIT) compiler has been part of CPython’s main branch since Python 3.13. PEP 744 described part of its initial design and explicitly deferred a number of questions about the JIT’s long-term status. Since then, the JIT has been re-architected and matured considerably. In Python 3.15, it delivers a measurable, reproducible speedup over the interpreter (about 4-12%…
This PEP proposes overloading the @ operator on types to allow writing Annotated[T, M] as T @M.
This PEP proposes freezing the standard HTML representation of the simple repository API, as originally specified in PEP 503 and updated over subsequent PEPs.