Replace type and module slots with a new, more type-safe structure that allows adding new slots in a more forward-compatible way.

This PEP proposes introducing JSON encoded core metadata and wheel file format metadata files in Python packages. Python package metadata (“core metadata”) was first defined in PEP 241 to use RFC...

This PEP outlines the expected support for WASI by CPython. It contains enough details to know what WASI and WASI SDK version is expected to be supported for any release of CPython while official...

This PEP proposes formalizing the membership and responsibilities policies of the Python Security Response Team (PSRT). The PSRT is a “highly trusted cabal of Python developers” which handles...

This PEP proposes a standard mechanism through which arbitrary Python package indices can support “Trusted Publishing,” a misuse-resistant credential exchange scheme already implemented by the...

The Stable ABI as abi3 can no longer be preserved, and requires replacement. abi2026 will be the first replacement, providing resolution of current known incompatibilities, with planned retirement...

This PEP relaxes the constraint on dynamic metadata listed in the [project] section in pyproject.toml. It is now permitted to define a static portion of a dynamic metadata field in the [project]...

Python allows the with and async with statements to handle multiple context managers in a single statement, so long as they are all respectively synchronous or asynchronous. When mixing...

This PEP specifies a name mapping mechanism that allows packaging tools to map external dependency identifiers (as introduced in PEP 725) to their counterparts in other package repositories.

Version 3.15 of the Stable ABI will be compatible with both free-threaded and GIL-enabled builds. To allow this, the PyObject internal structure and related APIs will be removed from version 3.15...

To analyze Python programs precisely, type checkers need to know when two classes can and cannot have a common child class. However, the information necessary to determine this is not currently...

This PEP proposes the creation of a new standard library module named profiling to organize Python’s built-in profiling tools under a single, coherent namespace.