PyPy v7.3.20: release of python 2.7, 3.11, released 2025-07-04

The PyPy team is proud to release version 7.3.20 of PyPy after the previous release on Feb 26, 2025. The release fixes some subtle bugs in ctypes and OrderedDict and makes PyPy3.11 compatible with an upcoming release of Cython.

The release includes two different interpreters:

  • PyPy2.7, which is an interpreter supporting the syntax and the features of Python 2.7 including the stdlib for CPython 2.7.18+ (the + is for backported security updates)

  • PyPy3.11, which is an interpreter supporting the syntax and the features of Python 3.11, including the stdlib for CPython 3.11.13.

The interpreters are based on much the same codebase, thus the double release. This is a micro release, all APIs are compatible with the other 7.3 releases.

We recommend updating. You can find links to download the 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. If PyPy is helping you out, we would love to hear about it and encourage submissions to our blog via a pull request to https://github.com/pypy/pypy.org

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: bug fixes, PyPy and RPython documentation improvements, or general help with making RPython’s JIT even better.

If you are a python library maintainer and use C-extensions, please consider making a HPy / CFFI / cppyy version of your library that would be performant on PyPy. In any case, cibuildwheel supports building wheels for PyPy.

What is PyPy?

PyPy is a Python interpreter, a drop-in replacement for CPython It’s fast (PyPy and CPython 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.

We provide binary builds for:

  • x86 machines on most common operating systems (Linux 32/64 bits, Mac OS 64 bits, Windows 64 bits)

  • 64-bit ARM machines running Linux (aarch64) and macos (macos_arm64).

PyPy supports Windows 32-bit, Linux PPC64 big- and little-endian, Linux ARM 32 bit, RISC-V RV64IMAFD Linux, and s390x Linux but does not release binaries. Please reach out to us if you wish to sponsor binary releases for those platforms. Downstream packagers provide binary builds for debian, Fedora, conda, OpenBSD, FreeBSD, Gentoo, and more.

Changelog

For all versions

  • Allow building with --withoutmod-cpyext

Bugfixes

  • Fix crash when the JIT copies an empty virtual dict (#5245)

  • Fix re.fullmatch in the presence of atomic groups (#5232) and possessive repeats (#5049)

  • Cleanup duplicate errcode var in pyssl_error() and duplicate get_socket_or_None() call in _SSLSocket.shutdown() (#5261)

  • Define _FILE_OFFSET_BITS and _LARGEFILE_SOURCE when building on 32-bit ARM (on older platforms)

  • Fix bug in OrderedDict.move_to_first (#5257)

Speedups and enhancements

  • Use wWinMain on Windows to remove the need for hand-written command line argument processing

  • Optimize add(x, x)

  • Optimize getarrayitem(p, i) and getarrayitem(p, i) sequences again (which got lost in some refactoring)

  • Add a Z3 memory model for heap accesses to be able to check the correctness of tests, and to find bugs in the optimizer with random traces.

  • Make alias checking in the optimizer slightly smarter. in particular, two applevel instances of different classes are now known not to alias.

  • Allow the annotator to const-fold len

  • Optimize list.__eq__ with a jit driver (#5300)

Python 3.11

  • Update vendored libexpat to 2.7.1

  • Update stdlib and version to 3.11.13 (#5290)

Bugfixes

  • Raise SyntaxError rather than ValueError when parsing null bytes in source code (#5234)

  • Fix LOAD_GLOBAL disassembly (#5238)

  • Fix pure python datetime.*.fromisoformat() to reject spaces in fraction part. Backported to CPython. (#5240), (python/cpython#130959)

  • Fix LDLIBRARY in sysconfig (#5249)

  • Add IO_REPARSE_TAG_MOUNT_POINT to stat for windows

  • Fix PyContextVar_Reset return type (#5252)

  • Add python3.8+ versions of Py_TRASHCAN macros (#3958)

  • Fix macos sysconfig LD* values (pypa/distutils#283)

  • Add missing LIB_ERR_SYS handling to pyssl_error() (python-trio/trio#3253)

  • Return bytes for emptystring in re.findall() (#5265)

  • Handle single base class in PyType_FromModuleAndSpec (#5267)

  • Fix keepalive problems with ctypes._cast_addr (#5247)

  • Remove special-case for weakrefs in ctypes GlobalPyobjContainer

  • Allow deepcopying of some ctypes structs and fix pickling (#3022)

  • Fix declaration of PyLong_As* functions (#5272)

  • Fix EINTR handling in time.sleep() on macos

  • Fix segfault when passing invalid closure to exec()

  • Fix *attr() type errors to match CPython

  • Fix TypeError handling in map() and zip() to match CPython

  • Add some missing invalid syntax cases for lambdas

  • Add more zlib constants (#5289)

  • Fix obscure case when a unicodeescape error handler changes the string

  • Add PyRange_Check (needed for newer cython)

  • Implement PyModule_FromDefAndSpec2, PyModule_FromDefAndSpec

  • Add PyGILState_GetThisThreadState (#5302)

Speedups and enhancements

  • Make int + long and int * long use rbigint.int_add and .int_mul. This always worked on pypy2 but somehow never made it to 3.

  • Add missing audit event in sys._getframe()

  • Speed up HPy object allocation by optimizing _finish_create_instance