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pypy wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 details and motivation toggle details and motivation subsection 1 1 rpython 2 project status 3 history toggle history subsection 3 1 funding 4 see also 5 notes 6 references 7 external links toggle the table of contents pypy 20 languages العربية català deutsch español فارسی suomi français bahasa indonesia italiano 日本語 한국어 മലയാളം bahasa melayu nederlands polski português русский türkçe українська 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia alternative implementation of the python programming language not to be confused with pypi the python official third party software repository pypy release mid 2007 19 years ago 2007 stable release 7 3 23 1 27 may 2026 4 months ago 27 may 2026 written in rpython operating system cross platform type python interpreter and compiler toolchain license mit website pypy org repository github com pypy pypy pypy ˈ p aɪ p aɪ is an implementation of the python programming language 2 pypy frequently runs much faster than the standard implementation cpython because pypy uses a just in time compiler 3 most python code runs well on pypy except for code that depends on cpython extensions which either does not work or incurs some overhead when run in pypy pypy itself is built using a technique known as meta tracing which is a mostly automatic transformation that takes an interpreter as input and produces a tracing just in time compiler as output since interpreters are usually easier to write than compilers but run slower this technique can make it easier to produce efficient implementations of programming languages pypy s meta tracing toolchain is called rpython pypy officially supports python 2 7 and 3 11 4 and has a few differences in implementations compared to cpython 5 details and motivation edit pypy aims to provide a common translation and support framework for producing implementations of dynamic languages emphasizing a separation between language specification and implementation aspects it also aims to provide a compliant implementation of the python programming language using the above framework enabling new advanced features without having to encode low level details into it 6 7 rpython edit the pypy interpreter itself is written in a restricted subset of python called rpython restricted python 8 rpython puts some constraints on the python language such that a variable s type can be inferred at compile time 9 the pypy project has developed a toolchain that analyzes rpython code and translates it into a form of byte code which can be lowered into c there used to be other backends in addition to c java c and javascript but those suffered from bitrot and have been removed thus the recursive logo of pypy is a snake swallowing itself since the rpython is translated by a python interpreter the code can also be run untranslated for testing and analysis which provides a nice test bed for research into dynamic languages it allows for pluggable garbage collectors as well as optionally enabling stackless python features finally it includes a just in time jit generator that builds a just in time compiler into the interpreter given a few annotations in the interpreter source code the generated jit compiler is a tracing jit 10 rpython has also been used to write non python language implementations such as a lisp based language called pixie 11 project status edit pypy as of version 7 3 17 is compatible with two cpython versions 2 7 and 3 10 12 13 the first pypy version compatible with cpython v3 is pypy v2 3 1 2014 14 the pypy interpreter compatible with cpython v3 is also known as pypy3 pypy has jit compilation support on 32 bit 64 bit x86 and 32 bit 64 bit arm processors 15 it is tested nightly on windows linux openbsd and mac os x pypy is able to run pure python software that does not rely on implementation specific features 16 there is a compatibility layer for cpython c api extensions called cpyext but it is incomplete and experimental the preferred way of interfacing with c shared libraries is through the built in c foreign function interface cffi or ctypes libraries history edit pypy is a followup to the psyco project a just in time specializing compiler for python developed by armin rigo between 2002 and 2010 pypy s aim is to have a just in time specializing compiler with scope which was not available for psyco clarification needed initially the rpython could also be compiled into java bytecode cil and javascript but these backends were removed due to lack of interest pypy was initially a research and development oriented project reaching a mature state of development and an official 1 0 release in mid 2007 its next focus was on releasing a production ready version with more cpython compatibility many of pypy s changes have been made during coding sprints in august 2008 pypy was able to run some popular python libraries like pylons 17 pyglet 18 nevow 19 and django 20 on 12 march 2010 pypy 1 2 was released focusing on speed it included a working though not yet stable just in time compiler 21 on 30 april 2011 pypy version 1 5 was released which reached compatibility with cpython 2 7 22 on 9 may 2013 pypy 2 0 was released which introduced alpha quality support for jit compilation on armv6 and armv7 jit and included cffi in the standard library 23 24 on 20 june 2014 pypy3 was declared stable 14 and introduced compatibility with the more modern python 3 it was released alongside pypy 2 3 1 and bears the same version number on 21 march 2017 the pypy project released version 5 7 of both pypy and pypy3 with the latter introducing beta quality support for python 3 5 25 on 26 april 2018 version 6 0 was released with support for python 2 7 and 3 5 still beta quality on windows 26 on 11 february 2019 version 7 0 was released with support for python 2 7 and 3 5 27 on 14 october 2019 version 7 2 was released with support for python 3 6 9 28 on 24 december 2019 version 7 3 was released with support for python 3 6 9 29 on 16 february 2020 the pypy team announced the move of the source code hosting from bitbucket to heptapod net with the repositories of the cffi c foreign function interface project a new logo and website design are also published however the author and the license of the new logo are unknown 30 on 29 december 2023 pypy announced hosting has moved to github and development will now be tracked with git 31 funding edit pypy was funded by the european union being a specific targeted research project 32 between december 2004 and march 2007 in june 2008 pypy announced funding being part of the google open source programs and has agreed to focus on making pypy more compatible with cpython in 2009 eurostars a european union funding agency specially focused on smes 33 accepted a proposal from pypy project members titled pyjit a fast and flexible toolkit for dynamic programming languages based on pypy eurostars funding lasted until august 2011 34 at pycon us 2011 the python software foundation provided a 10 000 grant for pypy to continue work on performance and compatibility with newer versions of the language 35 the port to arm architecture was sponsored in part by the raspberry pi foundation 23 the pypy project also accepts donations through its status blog pages 36 as of 2013 a variety of sub projects had funding python 3 version compatibility built in optimized numpy support for numerical calculations and software transactional memory support to allow better parallelism 23 see also edit free software portal computer programming portal bootstrapping compilers cython graalvm partial evaluation psyco self hosting self interpreter unladen swallow notes edit pypy v7 3 23 release interview maciej fijalkowski pypy 29 november 2015 pypy speed speed pypy org retrieved 2019 12 01 pypy 30 december 2024 differences between pypy and cpython pypy documentation 30 december 2024 samuele pedroni march 2007 pypy goals and architecture overview archived from the original on 2012 06 14 pypy goals and architecture overview mission statement retrieved 11 october 2013 our runtime interpreter is rpython coding guide pypy documentation it is a proper subset of python restricted in a way that enables easy analysis and efficient code generation ancona et al 2007 bolz carl cuni antonio fijalkowski maciej rigo armin tracing the meta level pypy s tracing jit compiler icooolps 09 doi 10 1145 1565824 1565827 timothy balridge interview pypy python compatibility pypy org 28 december 2019 retrieved 2020 12 15 pypy v7 3 7 bug fix release of 3 7 3 8 pypy org 25 october 2021 retrieved 2021 11 10 1 2 the pypy team 20 june 2014 pypy3 2 3 1 fulcrum pypy blog pypy v7 2 0 release of 2 7 and 3 6 pypy org 16 october 2019 pypy python compatibility 28 december 2019 running pylons on top of pypy 10 june 2008 running pyglet on top of pypy 20 february 2008 running nevow on top of pypy 20 june 2008 pypy runs unmodified django 1 0 beta 19 august 2008 introducing the pypy 1 2 release 30 april 2011 pypy 1 5 released catching up 12 march 2010 1 2 3 jake edge 15 may 2013 a look at the pypy 2 0 release lwn net pypy 2 0 einstein sandwich 9 may 2013 pypy2 7 and pypy3 5 v5 7 two in one release 21 march 2017 pypy2 7 and pypy3 5 v6 0 dual release 26 april 2018 cuni antonio 2019 02 11 pypy status blog pypy v7 0 0 triple release of 2 7 3 5 and 3 6 alpha pypy status blog retrieved 2020 08 17 mattip 2019 10 14 pypy status blog pypy v7 2 released pypy status blog retrieved 2020 08 17 mattip 2019 12 24 pypy status blog pypy v7 3 0 released pypy status blog pypy and cffi have moved to heptapod 16 february 2020 pypy has moved to git github 29 december 2023 eu community research and development information service entry eurostars aim higher project page on eureka network archived from the original on 2012 04 03 retrieved 2011 10 17 a thank you to the psf 22 march 2011 pypy status blog oh and btw pypy gets funding through eurostars 10 december 2010 references edit davide ancona massimo ancona antonio cuni nicholas d matsakis 2007 rpython a step towards reconciling dynamically and statically typed oo languages in proc dynamic language symposium dls 2007 acm press carl friedrich bolz antonio cuni maciej fijalkowski 2009 tracing the meta level pypy s tracing jit compiler in proc icooolps 2009 acm press corbet jonathan 11 may 2011 a brief experiment with pypy lwn net von eitzen chris 21 november 2011 pypy 1 7 widens the performance sweet spot the h heinz heise rose john 2 december 2011 a day with pypy oracle developer blog interview maciej fijalkowski pypy decisionstats blog 29 november 2015 external links edit official website v t e python implementations circuitpython clpython cpython cython micropython numba ironpython jython psyco pypy python for s60 shed skin stackless python unladen swallow more ides eric idle pycharm pydev spyder more topics wsgi asgi history of python zen of python designer guido van rossum software list python software foundation python conference pycon retrieved from https en wikipedia org w index php title pypy oldid 1369320507 categories 2007 software fp6 projects free software programmed in python python programming language implementations software programmed in python software using the mit license stack based virtual machines hidden categories articles with short description short description is different from wikidata wikipedia articles needing clarification from may 2013 this page was last edited on 14 august 2026 at 07 11 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents pypy 20 languages add topic