Compatibility: PyPy is highly compatible with existing python code. It supports cffi, cppyy, and can run popular python libraries like twisted, and django. It can also run NumPy, Scikit-learn and …

Dec 3, 2025 · What is PyPy? Historically, PyPy has been used to mean two things. The first is the RPython translation toolchain for generating interpreters for dynamic programming languages. …

Unlike other sandboxing approaches for Python, PyPy's does not try to limit language features considered "unsafe". Instead we replace all calls to external libraries (C or platform) with a …

Dec 3, 2025 · Welcome to the documentation for PyPy, a fast, compliant alternative implementation of the Python language. If you want to find out more about what PyPy is, have …

Dec 3, 2025 · What is PyPy? PyPy is a reimplementation of Python in Python, using the RPython translation toolchain. PyPy tries to find new answers about ease of creation, flexibility, …

Source 3.11 Source (tar.bz2); 3.11 Source (zip). 2.7 Source (tar.bz2); 2.7 Source (zip). More information Visit the more information page for other platforms, information about running …

Dec 3, 2025 · The quickest way to start using PyPy is to download a prebuilt binary for your OS and architecture. You may be able to use either use the most recent release or one of our …

CPython tries to do a gc.collect() automatically when the program finishes; not PyPy. (It is possible in both CPython and PyPy to design a case where several gc.collect() are needed …

PyPy supports C extension modules solely to provide basic functionality. If the extension module is for speedup purposes only, then it makes no sense to use it with PyPy at the moment.

Dec 3, 2025 · PyPy reuses almost all python modules of CPython’s standard library, currently from version 2.7.8. We sometimes need to modify modules and - more often - regression tests …