What is cpython-old?

This repository is a read-only mirror of CPython, the official implementation of the Python programming language. It exists mainly so developers can browse and study the Python source code on GitHub, since the primary version is kept in a different version control system. What you're looking at here is Python 3.11 in its early development stage (alpha 1), which means it's a work-in-progress version being tested before release. The repository contains all the underlying code that makes Python run: the interpreter that reads and executes your Python programs, the standard library (built-in modules for file handling, math, networking, and much more), documentation, and automated tests to catch bugs. If you want to understand how Python itself works under the hood, compile a custom version with special optimizations, or contribute a fix to the language, you'd use this code. For example, someone might clone it to add a performance improvement, then submit their changes back to the Python team. The README includes straightforward instructions: you run a configure script to set up your build, then use make to compile everything, and make test to verify it works correctly on your machine. Most people don't need to touch this directly, they just download and install a pre-built Python release from python.org. But for language maintainers, researchers, or anyone contributing to Python itself, this repository is the authoritative source. The project also emphasizes that it's completely free to use, even in proprietary software, and includes links to the official issue tracker, documentation, and a developer's guide for anyone wanting to pitch in.