PyPy v7.1.1: release of 2.7, and 3.6-beta

The PyPy team is proud to release a bug-fix release version 7.1.1 of PyPy, which includes two different interpreters:

  • PyPy2.7, which is an interpreter supporting the syntax and the features of Python 2.7
  • PyPy3.6-beta: this is the second official release of PyPy to support 3.6 features, although it is still considered beta quality.

The interpreters are based on much the same codebase, thus the double release.

As always, this release is 100% compatible with the previous one and fixed several issues and bugs raised by the growing community of PyPy users. We strongly recommend updating.

The PyPy3.6 release is still not production quality so your mileage may vary. There are open issues with incomplete compatibility and c-extension support.

You can download the v7.1.1 releases here:

We would like to thank our donors for the continued support of the PyPy project. If PyPy is not quite good enough for your needs, we are available for direct consulting work.

We would also like to thank our contributors and encourage new people to join the project. PyPy has many layers and we need help with all of them: PyPy and RPython documentation improvements, tweaking popular modules to run on pypy, or general help with making RPython’s JIT even better.

What is PyPy?

PyPy is a very compliant Python interpreter, almost a drop-in replacement for CPython 2.7, 3.6. It’s fast (PyPy and CPython 2.7.x performance comparison) due to its integrated tracing JIT compiler.

We also welcome developers of other dynamic languages to see what RPython can do for them.

This PyPy release supports:

  • x86 machines on most common operating systems (Linux 32/64 bits, Mac OS X 64 bits, Windows 32 bits, OpenBSD, FreeBSD)
  • big- and little-endian variants of PPC64 running Linux,
  • s390x running Linux

Unfortunately at the moment of writing our ARM buildbots are out of service, so for now we are not releasing any binary for the ARM architecture, although PyPy does support ARM 32 bit processors.


Changes shared across versions:

  • Improve performance of u''.append
  • Prevent a crash in zlib when flushing a closed stream
  • Fix a few corner cases when encountering unicode values above 0x110000
  • Teach the JIT how to handle very large constant lists, sets, or dicts
  • Fix building on ARM32 (issue 2984)
  • Fix a bug in register assignment in ARM32
  • Package windows DLLs needed by cffi modules next to the cffi c-extensions (issue 2988)
  • Cleanup and refactor JIT code to remove rpython.jit.metainterp.typesystem
  • Fix memoryviews of ctype structures with padding, (cpython issue 32780)
  • CFFI updated to as-yet-unreleased 1.12.3

Python 3.6 only:

  • Override some errno.E* values that were added to MSVC in v2010 so that errno.E* == errno.WSAE* as in CPython
  • Do the same optimization that CPython does for (1, 2, 3, *a) (but at the AST level)
  • str.maketrans was broken (issue 2991)
  • Raise a TypeError when using buffers and unicode such as ''.strip(buffer) and 'a' < buffer
  • Support _overlapped and asyncio on win32
  • Fix an issue where ''.join(list_of_strings) would rarely confuse utf8 and bytes (issue 2997)