PyPy 2.2.1 - Incrementalism.1

We’re pleased to announce PyPy 2.2.1, which targets version 2.7.3 of the Python language. This is a bugfix release over 2.2.

You can download the PyPy 2.2.1 release here:

What is PyPy?

PyPy is a very compliant Python interpreter, almost a drop-in replacement for CPython 2.7. It’s fast (pypy 2.2 and cpython 2.7.2 performance comparison) due to its integrated tracing JIT compiler.

This release supports x86 machines running Linux 32/64, Mac OS X 64, Windows 32, or ARM (ARMv6 or ARMv7, with VFPv3).

Work on the native Windows 64 is still stalling, we would welcome a volunteer to handle that.


This is a bugfix release. The most important bugs fixed are:

  • an issue in sockets’ reference counting emulation, showing up notably when using the ssl module and calling makefile().
  • Tkinter support on Windows.
  • If sys.maxunicode==65535 (on Windows and maybe OS/X), the json decoder incorrectly decoded surrogate pairs.
  • some FreeBSD fixes.

Note that CFFI 0.8.1 was released. Both versions 0.8 and 0.8.1 are compatible with both PyPy 2.2 and 2.2.1.

Cheers, Armin Rigo & everybody