Almost all Python packages today are accurately measurable by software composition analysis (SCA) tools. For projects that are not accurately measurable, there is no existing mechanism to annotate a Python package with composition data to improve measur...

Installation of the python.org Python distribution on Windows is complex. There are three main approaches with roughly equivalent levels of user experience, and yet all of these suffer from different limitations, including failing to satisfy modern usag...

Building CPython without the zlib compression library will no be longer supported, and the zlib module will be required in the standard library. The only exception is WASI, as zlib is not currently supported in CPython on WASI. Building the interpreter ...

Emscripten is a complete open source compiler toolchain. It compiles C/C++ code into WebAssembly/JavaScript executables, for use in JavaScript runtimes, including browsers and Node.js. The Rust language also maintains an Emscripten target.

This PEP proposes adding a new built-in variable, TYPE_CHECKING, to improve the experience of writing Python code with type annotations. It is evaluated as True when the code is being analyzed by a static type checker, and as False during normal runtime...

This PEP proposes a new platform tag series pyemscripten for binary Python package distributions for the Pyodide Python runtime.

As PEP 654 ExceptionGroup has come into widespread use across the Python community, some common but awkward patterns have emerged. We therefore propose adding two new methods to exception objects: