Earlier this year, an experimental just in time compiler was merged into CPython’s main development branch. While recent CPython releases have included other substantial internal changes, this addition represents a particularly significant departure from the way CPython has traditionally...

   Add Py COMPAT API VERSION and Py COMPAT API VERSION MAX macros to opt in for planned incompatible C API changes in a C extension. Maintainers can decide when they make their C extension compatible and also decide which future Python version they want to be compatible with.

   This PEP proposes a new special form, TypeIs, to allow annotating functions that can be used to narrow the type of a value, similar to the builtin isinstance . Unlike the existing typing.TypeGuard special form, TypeIs can narrow the type in both the if and else branches of a conditional.

   Add a C API to the limited C API to configure the Python initialization. It can be used with the stable ABI.

   This PEP proposes a collection of changes related to the upload and distribution of digitally signed attestations and metadata used to verify them on a Python package repository, such as PyPI.

   Introduce a standard format for a static description file with build details of Python installations.

   This PEP proposes adding Android as a supported platform in CPython. The initial goal is for Android to achieve Tier support in Python . .

   Add new convenient C APIs to format a type fully qualified name. No longer format type names differently depending on how types are implemented.

   This PEP proposes introducing syntactic sugar f x for the common pattern where a named argument is the same as the name of the variable corresponding to its value f x x .

   This PEP specifies a mechanism for storing package requirements in pyproject.toml files such that they are not included in any built distribution of the project.