Introduction

This PEP contains the index of all Python Enhancement Proposals, known as PEPs. PEP numbers are assigned by the PEP editors, and once assigned are never changed [1]. The version control history [2] of the PEP texts represent their historical record.

Index by Category

Numerical Index

	PEP	PEP Title	PEP Author(s)
P	1	PEP Purpose and Guidelines	Warsaw, Hylton, Goodger, Coghlan
PF	2	Procedure for Adding New Modules	Faassen
PW	3	Guidelines for Handling Bug Reports	Hylton
P	4	Deprecation of Standard Modules	Cannon, von Löwis
P	5	Guidelines for Language Evolution	Prescod
P	6	Bug Fix Releases	Aahz, Baxter
P	7	Style Guide for C Code	GvR, Warsaw
P	8	Style Guide for Python Code	GvR, Warsaw, Coghlan
PW	9	Sample Plaintext PEP Template	Warsaw
P	10	Voting Guidelines	Warsaw
P	11	Removing support for little used platforms	von Löwis, Cannon
P	12	Sample reStructuredText PEP Template	Goodger, Warsaw, Cannon
I	13	Python Language Governance	and community
I	20	The Zen of Python	Peters
PR	42	Feature Requests	Hylton
SF	100	Python Unicode Integration	Lemburg
I	101	Doing Python Releases 101	Warsaw, GvR
IS	102	Doing Python Micro Releases	Baxter, Warsaw, GvR
IW	103	Collecting information about git	Broytman
IF	160	Python 1.6 Release Schedule	Drake
IF	200	Python 2.0 Release Schedule	Hylton
SF	201	Lockstep Iteration	Warsaw
SF	202	List Comprehensions	Warsaw
SF	203	Augmented Assignments	Wouters
SR	204	Range Literals	Wouters
SF	205	Weak References	Drake
IW	206	Python Advanced Library	Kuchling
SF	207	Rich Comparisons	GvR, Ascher
SF	208	Reworking the Coercion Model	Schemenauer, Lemburg
SW	209	Multi-dimensional Arrays	Barrett, Oliphant
SR	210	Decoupling the Interpreter Loop	Ascher
SR	211	Adding A New Outer Product Operator	Wilson
SR	212	Loop Counter Iteration	Schneider-Kamp
SD	213	Attribute Access Handlers	Prescod
SF	214	Extended Print Statement	Warsaw
SS	215	String Interpolation	Yee
IR	216	Docstring Format	Zadka
SF	217	Display Hook for Interactive Use	Zadka
SF	218	Adding a Built-In Set Object Type	Wilson, Hettinger
SD	219	Stackless Python	McMillan
IR	220	Coroutines, Generators, Continuations	McMillan
SF	221	Import As	Wouters
SD	222	Web Library Enhancements	Kuchling
SF	223	Change the Meaning of \x Escapes	Peters
SR	224	Attribute Docstrings	Lemburg
SR	225	Elementwise/Objectwise Operators	Zhu, Lielens
IF	226	Python 2.1 Release Schedule	Hylton
SF	227	Statically Nested Scopes	Hylton
SW	228	Reworking Python's Numeric Model	Zadka, GvR
SF	229	Using Distutils to Build Python	Kuchling
SF	230	Warning Framework	GvR
SR	231	__findattr__()	Warsaw
SF	232	Function Attributes	Warsaw
SD	233	Python Online Help	Prescod
SF	234	Iterators	Yee, GvR
SF	235	Import on Case-Insensitive Platforms	Peters
SF	236	Back to the __future__	Peters
SF	237	Unifying Long Integers and Integers	Zadka, GvR
SF	238	Changing the Division Operator	Zadka, GvR
SR	239	Adding a Rational Type to Python	Craig, Zadka
SR	240	Adding a Rational Literal to Python	Craig, Zadka
SF	241	Metadata for Python Software Packages	Kuchling
SR	242	Numeric Kinds	Dubois
SW	243	Module Repository Upload Mechanism	Reifschneider
SR	244	The directive statement	von Löwis
SR	245	Python Interface Syntax	Pelletier
SR	246	Object Adaptation	Martelli, Evans
IF	247	API for Cryptographic Hash Functions	Kuchling
IF	248	Python Database API Specification v1.0	Lemburg
IF	249	Python Database API Specification v2.0	Lemburg
SF	250	Using site-packages on Windows	Moore
IF	251	Python 2.2 Release Schedule	Warsaw, GvR
SF	252	Making Types Look More Like Classes	GvR
SF	253	Subtyping Built-in Types	GvR
SR	254	Making Classes Look More Like Types	GvR
SF	255	Simple Generators	Schemenauer, Peters, Hetland
SR	256	Docstring Processing System Framework	Goodger
I	257	Docstring Conventions	Goodger, GvR
SR	258	Docutils Design Specification	Goodger
SR	259	Omit printing newline after newline	GvR
SF	260	Simplify xrange()	GvR
SF	261	Support for "wide" Unicode characters	Prescod
SD	262	A Database of Installed Python Packages	Kuchling
SF	263	Defining Python Source Code Encodings	Lemburg, von Löwis
SF	264	Future statements in simulated shells	Hudson
SR	265	Sorting Dictionaries by Value	Griffin
SW	266	Optimizing Global Variable/Attribute Access	Montanaro
SD	267	Optimized Access to Module Namespaces	Hylton
SR	268	Extended HTTP functionality and WebDAV	Stein
SD	269	Pgen Module for Python	Riehl
SR	270	uniq method for list objects	Petrone
SR	271	Prefixing sys.path by command line option	Giacometti
IF	272	API for Block Encryption Algorithms v1.0	Kuchling
SF	273	Import Modules from Zip Archives	Ahlstrom
SF	274	Dict Comprehensions	Warsaw
SR	275	Switching on Multiple Values	Lemburg
SR	276	Simple Iterator for ints	Althoff
SF	277	Unicode file name support for Windows NT	Hodgson
SF	278	Universal Newline Support	Jansen
SF	279	The enumerate() built-in function	Hettinger
SD	280	Optimizing access to globals	GvR
SR	281	Loop Counter Iteration with range and xrange	Hetland
SF	282	A Logging System	Sajip, Mick
IF	283	Python 2.3 Release Schedule	GvR
SR	284	Integer for-loops	Eppstein, Ewing
SF	285	Adding a bool type	GvR
SD	286	Enhanced Argument Tuples	von Löwis
I	287	reStructuredText Docstring Format	Goodger
SW	288	Generators Attributes and Exceptions	Hettinger
SF	289	Generator Expressions	Hettinger
I	290	Code Migration and Modernization	Hettinger
IF	291	Backward Compatibility for the Python 2 Standard ...	Norwitz
SF	292	Simpler String Substitutions	Warsaw
SF	293	Codec Error Handling Callbacks	Dörwald
SR	294	Type Names in the types Module	Tirosh
SR	295	Interpretation of multiline string constants	Koltsov
SW	296	Adding a bytes Object Type	Gilbert
SR	297	Support for System Upgrades	Lemburg
SW	298	The Locked Buffer Interface	Heller
SR	299	Special __main__() function in modules	Epler
SF	301	Package Index and Metadata for Distutils	Jones
SF	302	New Import Hooks	JvR, Moore
SR	303	Extend divmod() for Multiple Divisors	Bellman
SW	304	Controlling Generation of Bytecode Files	Montanaro
SF	305	CSV File API	Altis, Cole, McNamara, Montanaro, Wells
IW	306	How to Change Python's Grammar	Hudson, Diederich, Coghlan, Peterson
SF	307	Extensions to the pickle protocol	GvR, Peters
SF	308	Conditional Expressions	GvR, Hettinger
SF	309	Partial Function Application	Harris
SR	310	Reliable Acquisition/Release Pairs	Hudson, Moore
SF	311	Simplified Global Interpreter Lock Acquisition for ...	Hammond
SD	312	Simple Implicit Lambda	Suzi, Martelli
SR	313	Adding Roman Numeral Literals to Python	Meyer
SF	314	Metadata for Python Software Packages v1.1	Kuchling, Jones
SR	315	Enhanced While Loop	Hettinger, Carroll
SD	316	Programming by Contract for Python	Way
SR	317	Eliminate Implicit Exception Instantiation	Taschuk
SF	318	Decorators for Functions and Methods	Smith
SR	319	Python Synchronize/Asynchronize Block	Pelletier
IF	320	Python 2.4 Release Schedule	Warsaw, Hettinger, Baxter
SW	321	Date/Time Parsing and Formatting	Kuchling
SF	322	Reverse Iteration	Hettinger
SD	323	Copyable Iterators	Martelli
SF	324	subprocess - New process module	Astrand
SR	325	Resource-Release Support for Generators	Pedroni
SR	326	A Case for Top and Bottom Values	Carlson, Reedy
SF	327	Decimal Data Type	Batista
SF	328	Imports: Multi-Line and Absolute/Relative	Aahz
SR	329	Treating Builtins as Constants in the Standard Library	Hettinger
SR	330	Python Bytecode Verification	Pelletier
SF	331	Locale-Independent Float/String Conversions	Reis
SR	332	Byte vectors and String/Unicode Unification	Montanaro
IF	333	Python Web Server Gateway Interface v1.0	Eby
SW	334	Simple Coroutines via SuspendIteration	Evans
SR	335	Overloadable Boolean Operators	Ewing
SR	336	Make None Callable	McClelland
SD	337	Logging Usage in the Standard Library	Dubner
SF	338	Executing modules as scripts	Coghlan
IW	339	Design of the CPython Compiler	Cannon
SR	340	Anonymous Block Statements	GvR
SF	341	Unifying try-except and try-finally	Brandl
SF	342	Coroutines via Enhanced Generators	GvR, Eby
SF	343	The "with" Statement	GvR, Coghlan
SS	344	Exception Chaining and Embedded Tracebacks	Yee
SF	345	Metadata for Python Software Packages 1.2	Jones
SW	346	User Defined ("with") Statements	Coghlan
PF	347	Migrating the Python CVS to Subversion	von Löwis
SR	348	Exception Reorganization for Python 3.0	Cannon
SR	349	Allow str() to return unicode strings	Schemenauer
IR	350	Codetags	Elliott
SR	351	The freeze protocol	Warsaw
SF	352	Required Superclass for Exceptions	Cannon, GvR
SF	353	Using ssize_t as the index type	von Löwis
SS	354	Enumerations in Python	Finney
SR	355	Path - Object oriented filesystem paths	Lindqvist
IF	356	Python 2.5 Release Schedule	Norwitz, GvR, Baxter
SF	357	Allowing Any Object to be Used for Slicing	Oliphant
SF	358	The "bytes" Object	Schemenauer, GvR
SW	359	The "make" Statement	Bethard
PF	360	Externally Maintained Packages	Cannon
IF	361	Python 2.6 and 3.0 Release Schedule	Norwitz, Warsaw
SF	362	Function Signature Object	Cannon, Seo, Selivanov, Hastings
SR	363	Syntax For Dynamic Attribute Access	North
SW	364	Transitioning to the Py3K Standard Library	Warsaw
SR	365	Adding the pkg_resources module	Eby
SF	366	Main module explicit relative imports	Coghlan
SS	367	New Super	Spealman, Delaney
SD	368	Standard image protocol and class	Mastrodomenico
SW	369	Post import hooks	Heimes
SF	370	Per user site-packages directory	Heimes
SF	371	Addition of the multiprocessing package to the ...	Noller, Oudkerk
SF	372	Adding an ordered dictionary to collections	Ronacher, Hettinger
IF	373	Python 2.7 Release Schedule	Peterson
PF	374	Choosing a distributed VCS for the Python project	Cannon, Turnbull, Vassalotti, Warsaw, Ochtman
IF	375	Python 3.1 Release Schedule	Peterson
SF	376	Database of Installed Python Distributions	Ziadé
SR	377	Allow __enter__() methods to skip the statement body	Coghlan
SF	378	Format Specifier for Thousands Separator	Hettinger
SW	379	Adding an Assignment Expression	Whitley
SF	380	Syntax for Delegating to a Subgenerator	Ewing
SW	381	Mirroring infrastructure for PyPI	Ziadé, v. Löwis
SR	382	Namespace Packages	v. Löwis
SF	383	Non-decodable Bytes in System Character Interfaces	v. Löwis
SF	384	Defining a Stable ABI	v. Löwis
PF	385	Migrating from Subversion to Mercurial	Ochtman, Pitrou, Brandl
SS	386	Changing the version comparison module in Distutils	Ziadé
P	387	Backwards Compatibility Policy	Peterson
SF	389	argparse - New Command Line Parsing Module	Bethard
SR	390	Static metadata for Distutils	Ziadé
SF	391	Dictionary-Based Configuration For Logging	Sajip
IF	392	Python 3.2 Release Schedule	Brandl
SF	393	Flexible String Representation	v. Löwis
I	394	The "python" Command on Unix-Like Systems	Staley, Coghlan, Warsaw, Viktorin, Hrončok, Willing
SW	395	Qualified Names for Modules	Coghlan
ID	396	Module Version Numbers	Warsaw
SF	397	Python launcher for Windows	Hammond, v. Löwis
IF	398	Python 3.3 Release Schedule	Brandl
IF	399	Pure Python/C Accelerator Module Compatibility ...	Cannon
SD	400	Deprecate codecs.StreamReader and codecs.StreamWriter	Stinner
PR	401	BDFL Retirement	Warsaw, Cannon
SR	402	Simplified Package Layout and Partitioning	Eby
SD	403	General purpose decorator clause (aka "@in" clause)	Coghlan
IF	404	Python 2.8 Un-release Schedule	Warsaw
SF	405	Python Virtual Environments	Meyer
SW	406	Improved Encapsulation of Import State	Coghlan, Slodkowicz
PD	407	New release cycle and introducing long-term support ...	Pitrou, Brandl, Warsaw
SR	408	Standard library __preview__ package	Coghlan, Bendersky
SF	409	Suppressing exception context	Furman
SR	410	Use decimal.Decimal type for timestamps	Stinner
I	411	Provisional packages in the Python standard library	Coghlan, Bendersky
SF	412	Key-Sharing Dictionary	Shannon
PW	413	Faster evolution of the Python Standard Library	Coghlan
SF	414	Explicit Unicode Literal for Python 3.3	Ronacher, Coghlan
SF	415	Implement context suppression with exception attributes	Peterson
SR	416	Add a frozendict builtin type	Stinner
SF	417	Including mock in the Standard Library	Foord
SF	418	Add monotonic time, performance counter, and ...	Simpson, Jewett, Turnbull, Stinner
SD	419	Protecting cleanup statements from interruptions	Colomiets
SF	420	Implicit Namespace Packages	Smith
SF	421	Adding sys.implementation	Snow
SW	422	Simpler customisation of class creation	Coghlan, Urban
ID	423	Naming conventions and recipes related to packaging	Bryon
SF	424	A method for exposing a length hint	Gaynor
SF	425	Compatibility Tags for Built Distributions	Holth
IW	426	Metadata for Python Software Packages 2.0	Coghlan, Holth, Stufft
SF	427	The Wheel Binary Package Format 1.0	Holth
SF	428	The pathlib module -- object-oriented filesystem paths	Pitrou
IF	429	Python 3.4 Release Schedule	Hastings
IF	430	Migrating to Python 3 as the default online ...	Coghlan
SS	431	Time zone support improvements	Regebro
S	432	Restructuring the CPython startup sequence	Coghlan, Stinner, Snow
SS	433	Easier suppression of file descriptor inheritance	Stinner
I	434	IDLE Enhancement Exception for All Branches	Rovito, Reedy
SF	435	Adding an Enum type to the Python standard library	Warsaw, Bendersky, Furman
SF	436	The Argument Clinic DSL	Hastings
SR	437	A DSL for specifying signatures, annotations and ...	Krah
PS	438	Transitioning to release-file hosting on PyPI	Krekel, Meyer
SR	439	Inclusion of implicit pip bootstrap in Python ...	Jones
I	440	Version Identification and Dependency Specification	Coghlan, Stufft
SF	441	Improving Python ZIP Application Support	Holth, Moore
SF	442	Safe object finalization	Pitrou
SF	443	Single-dispatch generic functions	Langa
ID	444	Python Web3 Interface	McDonough, Ronacher
SF	445	Add new APIs to customize Python memory allocators	Stinner
SF	446	Make newly created file descriptors non-inheritable	Stinner
SD	447	Add __getdescriptor__ method to metaclass	Oussoren
SF	448	Additional Unpacking Generalizations	Landau
PF	449	Removal of the PyPI Mirror Auto Discovery and ...	Stufft
SF	450	Adding A Statistics Module To The Standard Library	D'Aprano
SF	451	A ModuleSpec Type for the Import System	Snow
IF	452	API for Cryptographic Hash Functions v2.0	Kuchling, Heimes
SF	453	Explicit bootstrapping of pip in Python installations	Stufft, Coghlan
SF	454	Add a new tracemalloc module to trace Python memory ...	Stinner
SR	455	Adding a key-transforming dictionary to collections	Pitrou
SF	456	Secure and interchangeable hash algorithm	Heimes
IF	457	Notation For Positional-Only Parameters	Hastings
SA	458	Secure PyPI downloads with signed repository metadata	Kuppusamy, Diaz, Moore, Puehringer, Lock, DeLong, Cappos
SW	459	Standard Metadata Extensions for Python Software ...	Coghlan
SW	460	Add binary interpolation and formatting	Pitrou
SF	461	Adding % formatting to bytes and bytearray	Furman
PW	462	Core development workflow automation for CPython	Coghlan
SR	463	Exception-catching expressions	Angelico
PF	464	Removal of the PyPI Mirror Authenticity API	Stufft
SF	465	A dedicated infix operator for matrix multiplication	Smith
SF	466	Network Security Enhancements for Python 2.7.x	Coghlan
SD	467	Minor API improvements for binary sequences	Coghlan, Furman
SF	468	Preserving the order of **kwargs in a function.	Snow
SW	469	Migration of dict iteration code to Python 3	Coghlan
PF	470	Removing External Hosting Support on PyPI	Stufft
SF	471	os.scandir() function -- a better and faster ...	Hoyt
SR	472	Support for indexing with keyword arguments	Borini, Martinot-Lagarde
SR	473	Adding structured data to built-in exceptions	Kreft
PW	474	Creating forge.python.org	Coghlan
SF	475	Retry system calls failing with EINTR	Natali, Stinner
SF	476	Enabling certificate verification by default for ...	Gaynor
SF	477	Backport ensurepip (PEP 453) to Python 2.7	Stufft, Coghlan
I	478	Python 3.5 Release Schedule	Hastings
SF	479	Change StopIteration handling inside generators	Angelico, GvR
SD	480	Surviving a Compromise of PyPI: The Maximum ...	Kuppusamy, Diaz, Cappos
PW	481	Migrate CPython to Git, Github, and Phabricator	Stufft
IF	482	Literature Overview for Type Hints	Langa
IF	483	The Theory of Type Hints	GvR, Levkivskyi
SP	484	Type Hints	GvR, Lehtosalo, Langa
SF	485	A Function for testing approximate equality	Barker
SF	486	Make the Python Launcher aware of virtual environments	Moore
SF	487	Simpler customisation of class creation	Teichmann
SF	488	Elimination of PYO files	Cannon
SF	489	Multi-phase extension module initialization	Viktorin, Behnel, Coghlan
SR	490	Chain exceptions at C level	Stinner
SD	491	The Wheel Binary Package Format 1.9	Holth
SF	492	Coroutines with async and await syntax	Selivanov
SF	493	HTTPS verification migration tools for Python 2.7	Coghlan, Kuska, Lemburg
I	494	Python 3.6 Release Schedule	Deily
SF	495	Local Time Disambiguation	Belopolsky, Peters
IR	496	Environment Markers	Polley
PR	497	A standard mechanism for backward compatibility	Schofield
SF	498	Literal String Interpolation	Smith
SD	499	python -m foo should bind ...	Simpson, Angelico, Jevnik
SR	500	A protocol for delegating datetime methods to their ...	Belopolsky, Peters
SD	501	General purpose string interpolation	Coghlan
IR	502	String Interpolation - Extended Discussion	Miller
IA	503	Simple Repository API	Stufft
SW	504	Using the System RNG by default	Coghlan
SD	505	None-aware operators	Haase, Dower
SF	506	Adding A Secrets Module To The Standard Library	D'Aprano
PR	507	Migrate CPython to Git and GitLab	Warsaw
I	508	Dependency specification for Python Software Packages	Collins
SF	509	Add a private version to dict	Stinner
SR	510	Specialize functions with guards	Stinner
SR	511	API for code transformers	Stinner
PF	512	Migrating from hg.python.org to GitHub	Cannon
I	513	A Platform Tag for Portable Linux Built Distributions	McGibbon, Smith
I	514	Python registration in the Windows registry	Dower
SF	515	Underscores in Numeric Literals	Brandl, Storchaka
SR	516	Build system abstraction for pip/conda etc	Collins, Smith
SP	517	A build-system independent format for source trees	Smith, Kluyver
SF	518	Specifying Minimum Build System Requirements for ...	Cannon, Smith, Stufft
SF	519	Adding a file system path protocol	Cannon, Zevenhoven
SF	520	Preserving Class Attribute Definition Order	Snow
SW	521	Managing global context via 'with' blocks in ...	Smith
SR	522	Allow BlockingIOError in security sensitive APIs	Coghlan, Smith
SF	523	Adding a frame evaluation API to CPython	Cannon, Viehland
SF	524	Make os.urandom() blocking on Linux	Stinner
SF	525	Asynchronous Generators	Selivanov
SF	526	Syntax for Variable Annotations	Gonzalez, House, Levkivskyi, Roach, GvR
PA	527	Removing Un(der)used file types/extensions on PyPI	Stufft
SF	528	Change Windows console encoding to UTF-8	Dower
SF	529	Change Windows filesystem encoding to UTF-8	Dower
SF	530	Asynchronous Comprehensions	Selivanov
SW	531	Existence checking operators	Coghlan
SD	532	A circuit breaking protocol and binary operators	Coghlan, Haase
SD	533	Deterministic cleanup for iterators	Smith
SD	534	Improved Errors for Missing Standard Library Modules	Orsava, Viktorin, Coghlan
SD	535	Rich comparison chaining	Coghlan
SD	536	Final Grammar for Literal String Interpolation	Angerer
I	537	Python 3.7 Release Schedule	Deily
SF	538	Coercing the legacy C locale to a UTF-8 based locale	Coghlan
SF	539	A New C-API for Thread-Local Storage in CPython	Bray, Yamamoto
SF	540	Add a new UTF-8 Mode	Stinner
PF	541	Package Index Name Retention	Langa
SR	542	Dot Notation Assignment In Function Header	Meskanen
S	543	A Unified TLS API for Python	Benfield, Heimes
SA	544	Protocols: Structural subtyping (static duck typing)	Levkivskyi, Lehtosalo, Langa
PF	545	Python Documentation Translations	Palard, Naoki, Stinner
SR	546	Backport ssl.MemoryBIO and ssl.SSLObject to Python 2.7	Stinner, Benfield
SD	547	Running extension modules using the -m option	Plch, Viktorin
SR	548	More Flexible Loop Control	Murray
SR	549	Instance Descriptors	Hastings
SW	550	Execution Context	Selivanov, Pranskevichus
I	551	Security transparency in the Python runtime	Dower
SF	552	Deterministic pycs	Peterson
SF	553	Built-in breakpoint()	Warsaw
S	554	Multiple Interpreters in the Stdlib	Snow
SW	555	Context-local variables (contextvars)	Zevenhoven
SD	556	Threaded garbage collection	Pitrou
SF	557	Data Classes	Smith
S	558	Defined semantics for locals()	Coghlan
SR	559	Built-in noop()	Warsaw
SA	560	Core support for typing module and generic types	Levkivskyi
SA	561	Distributing and Packaging Type Information	Smith
SF	562	Module __getattr__ and __dir__	Levkivskyi
SA	563	Postponed Evaluation of Annotations	Langa
SF	564	Add new time functions with nanosecond resolution	Stinner
SF	565	Show DeprecationWarning in __main__	Coghlan
SF	566	Metadata for Python Software Packages 2.1	Ingram
SF	567	Context Variables	Selivanov
SD	568	Generator-sensitivity for Context Variables	Smith
I	569	Python 3.8 Release Schedule	Langa
SA	570	Python Positional-Only Parameters	Hastings, Galindo, Corchero, Weele
I	571	The manylinux2010 Platform Tag	Williams, Thomas, Kluyver
SA	572	Assignment Expressions	Angelico, Peters, GvR
SA	573	Module State Access from C Extension Methods	Viktorin, Coghlan, Snow, Plch
SF	574	Pickle protocol 5 with out-of-band data	Pitrou
SW	575	Unifying function/method classes	Demeyer
SW	576	Rationalize Built-in function classes	Shannon
SW	577	Augmented Assignment Expressions	Coghlan
SA	578	Python Runtime Audit Hooks	Dower
IF	579	Refactoring C functions and methods	Demeyer
SR	580	The C call protocol	Demeyer
PA	581	Using GitHub Issues for CPython	Mariatta
S	582	Python local packages directory	Das, Dower, Stufft, Coghlan
IW	583	A Concurrency Memory Model for Python	Yasskin
SA	584	Add Union Operators To dict	D'Aprano, Bucher
SA	585	Type Hinting Generics In Standard Collections	Langa
SA	586	Literal Types	Lee, Levkivskyi, Lehtosalo
SF	587	Python Initialization Configuration	Stinner, Coghlan
I	588	GitHub Issues Migration Plan	Mariatta
SA	589	TypedDict: Type Hints for Dictionaries with a Fixed ...	Lehtosalo
SA	590	Vectorcall: a fast calling protocol for CPython	Shannon, Demeyer
SA	591	Adding a final qualifier to typing	Sullivan, Levkivskyi
SF	592	Adding "Yank" Support to the Simple API	Stufft
SA	593	Flexible function and variable annotations	Varoquaux, Kashin
S	594	Removing dead batteries from the standard library	Heimes
P	595	Improving bugs.python.org	Melotti, Peksag
I	596	Python 3.9 Release Schedule	Langa
S	597	Soft deprecation of omitting encoding	Naoki
IW	598	Introducing incremental feature releases	Coghlan
IF	599	The manylinux2014 Platform Tag	Ingram
IA	600	Future 'manylinux' Platform Tags for Portable Linux ...	Smith, Kluyver
SR	601	Forbid return/break/continue breaking out of finally	George, Taskaya
IA	602	Annual Release Cycle for Python	Langa
S	603	Adding a frozenmap type to collections	Selivanov
S	604	Complementary syntax for Union[]	PRADOS
IR	605	A rolling feature release stream for CPython	Dower, Coghlan
SR	606	Python Compatibility Version	Stinner
IF	607	Reducing CPython's Feature Delivery Latency	Langa, Dower, Coghlan
SR	608	Coordinated Python release	Hrončok, Stinner
P	609	PyPA Governance	Ingram, Gedam
SP	610	Recording the Direct URL Origin of installed ...	Bidoul, Jerdonek
S	611	The one million limit	Shannon
S	612	Parameter Specification Variables	Mendoza
SA	613	Explicit Type Aliases	Zhu
SA	614	Relaxing Grammar Restrictions On Decorators	Bucher
SA	615	Support for the IANA Time Zone Database in the ...	Ganssle
SA	616	String methods to remove prefixes and suffixes	Sweeney
SA	617	New PEG parser for CPython	GvR, Galindo, Nikolaou
S	618	Add Optional Length-Checking To zip	Bucher
I	619	Python 3.10 Release Schedule	Salgado
SF	628	Add math.tau	Coghlan
SR	666	Reject Foolish Indentation	Creighton
SR	754	IEEE 754 Floating Point Special Values	Warnes
I	801	Reserved	Warsaw
PF	3000	Python 3000	GvR
PW	3001	Procedure for reviewing and improving standard ...	Brandl
PF	3002	Procedure for Backwards-Incompatible Changes	Bethard
PF	3003	Python Language Moratorium	Cannon, Noller, GvR
PF	3099	Things that will Not Change in Python 3000	Brandl
PF	3100	Miscellaneous Python 3.0 Plans	Cannon
SF	3101	Advanced String Formatting	Talin
SF	3102	Keyword-Only Arguments	Talin
SR	3103	A Switch/Case Statement	GvR
SF	3104	Access to Names in Outer Scopes	Yee
SF	3105	Make print a function	Brandl
SF	3106	Revamping dict.keys(), .values() and .items()	GvR
SF	3107	Function Annotations	Winter, Lownds
SF	3108	Standard Library Reorganization	Cannon
SF	3109	Raising Exceptions in Python 3000	Winter
SF	3110	Catching Exceptions in Python 3000	Winter
SF	3111	Simple input built-in in Python 3000	Roberge
SF	3112	Bytes literals in Python 3000	Orendorff
SF	3113	Removal of Tuple Parameter Unpacking	Cannon
SF	3114	Renaming iterator.next() to iterator.__next__()	Yee
SF	3115	Metaclasses in Python 3000	Talin
SF	3116	New I/O	Stutzbach, GvR, Verdone
SR	3117	Postfix type declarations	Brandl
SF	3118	Revising the buffer protocol	Oliphant, Banks
SF	3119	Introducing Abstract Base Classes	GvR, Talin
SF	3120	Using UTF-8 as the default source encoding	von Löwis
SA	3121	Extension Module Initialization and Finalization	von Löwis
SR	3122	Delineation of the main module	Cannon
SF	3123	Making PyObject_HEAD conform to standard C	von Löwis
SD	3124	Overloading, Generic Functions, Interfaces, and ...	Eby
SR	3125	Remove Backslash Continuation	Jewett
SR	3126	Remove Implicit String Concatenation	Jewett, Hettinger
SF	3127	Integer Literal Support and Syntax	Maupin
SR	3128	BList: A Faster List-like Type	Stutzbach
SF	3129	Class Decorators	Winter
SR	3130	Access to Current Module/Class/Function	Jewett
SF	3131	Supporting Non-ASCII Identifiers	von Löwis
SF	3132	Extended Iterable Unpacking	Brandl
SR	3133	Introducing Roles	Winter
SF	3134	Exception Chaining and Embedded Tracebacks	Yee
SF	3135	New Super	Spealman, Delaney, Ryan
SR	3136	Labeled break and continue	Chisholm
SF	3137	Immutable Bytes and Mutable Buffer	GvR
SF	3138	String representation in Python 3000	Ishimoto
SR	3139	Cleaning out sys and the "interpreter" module	Peterson
SR	3140	str(container) should call str(item), not repr(item)	Broytman, Jewett
SF	3141	A Type Hierarchy for Numbers	Yasskin
SR	3142	Add a "while" clause to generator expressions	Britton
SD	3143	Standard daemon process library	Finney
SF	3144	IP Address Manipulation Library for the Python ...	Moody
SW	3145	Asynchronous I/O For subprocess.Popen	Pruitt, McCreary, Carlson
SW	3146	Merging Unladen Swallow into CPython	Winter, Yasskin, Kleckner
SF	3147	PYC Repository Directories	Warsaw
SF	3148	futures - execute computations asynchronously	Quinlan
SF	3149	ABI version tagged .so files	Warsaw
SD	3150	Statement local namespaces (aka "given" clause)	Coghlan
SF	3151	Reworking the OS and IO exception hierarchy	Pitrou
SR	3152	Cofunctions	Ewing
SS	3153	Asynchronous IO support	Houtven
SF	3154	Pickle protocol version 4	Pitrou
SF	3155	Qualified name for classes and functions	Pitrou
SF	3156	Asynchronous IO Support Rebooted: the "asyncio" Module	GvR
IF	3333	Python Web Server Gateway Interface v1.0.1	Eby
I	8000	Python Language Governance Proposal Overview	Warsaw
PA	8001	Python Governance Voting Process	Cannon, Heimes, Stufft, Snow, Smith, Langa, Mariatta, Smith, Salgado, Hettinger, Einat, Peters, Ware
I	8002	Open Source Governance Survey	Warsaw, Langa, Pitrou, Hellmann, Willing
IR	8010	The Technical Leader Governance Model	Warsaw
IR	8011	Python Governance Model Lead by Trio of Pythonistas	Mariatta, Warsaw
IR	8012	The Community Governance Model	Langa
IR	8013	The External Council Governance Model	Dower
IR	8014	The Commons Governance Model	Jansen
IR	8015	Organization of the Python community	Stinner
IA	8016	The Steering Council Model	Smith, Stufft
I	8100	January 2019 steering council election	Smith, III
I	8101	2020 Term steering council election	Jodlowska, III

Reserved PEP Numbers

	PEP	PEP Title	PEP Author(s)
	801	RESERVED	Warsaw

PEP Types Key

I - Informational PEP

P - Process PEP

S - Standards Track PEP

PEP Status Key

A - Accepted (Standards Track only) or Active proposal

D - Deferred proposal

F - Final proposal

P - Provisional proposal

R - Rejected proposal

S - Superseded proposal

W - Withdrawn proposal

Authors/Owners

Name	Email Address
Aahz	aahz at pythoncraft.com
Ahlstrom, James C.	jim at interet.com
Althoff, Jim	james_althoff at i2.com
Altis, Kevin	altis at semi-retired.com
and community, The Python core team
Angelico, Chris	rosuav at gmail.com
Angerer, Philipp	phil.angerer at gmail.com
Ascher, David	davida at activestate.com
Astrand, Peter	astrand at lysator.liu.se
Banks, Carl	pythondev at aerojockey.com
Barker, Christopher	chris.barker at noaa.gov
Barrett, Paul	barrett at stsci.edu
Batista, Facundo	facundo at taniquetil.com.ar
Baxter, Anthony	anthony at interlink.com.au
Behnel, Stefan	stefan_ml at behnel.de
Bellman, Thomas	bellman+pep-divmod at lysator.liu.se
Belopolsky, Alexander	alexander.belopolsky at gmail.com
Bendersky, Eli	eliben at gmail.com
Benfield, Cory	cory at lukasa.co.uk
Bethard, Steven	steven.bethard at gmail.com
Bidoul, Stéphane	stephane.bidoul at gmail.com
Borini, Stefano
Brandl, Georg	georg at python.org
Bray, Erik M.
Britton, Gerald	gerald.britton at gmail.com
Broytman, Oleg	phd at phdru.name
Bryon, Benoit	benoit at marmelune.net
Bucher, Brandt	brandtbucher at gmail.com
Cannon, Brett	brett at python.org
Cappos, Justin	jcappos at nyu.edu
Carlson, Josiah	jcarlson at uci.edu
Carroll, W Isaac	icarroll at pobox.com
Chisholm, Matt	matt-python at theory.org
Coghlan, Nick	ncoghlan at gmail.com
Cole, Dave	djc at object-craft.com.au
Collins, Robert	rbtcollins at hp.com
Colomiets, Paul	paul at colomiets.name
Corchero, Mario	mariocj89 at gmail.com
Craig, Christopher A.	python-pep at ccraig.org
Creighton, Laura	lac at strakt.com
D'Aprano, Steven	steve at pearwood.info
Das, Kushal	mail at kushaldas.in
Deily, Ned	nad at python.org
Delaney, Tim	timothy.c.delaney at gmail.com
DeLong, Lois Anne	lad278 at nyu.edu
Demeyer, Jeroen	j.demeyer at ugent.be
Diaz, Vladimir	vladimir.diaz at nyu.edu
Diederich, Jack	jackdied at gmail.com
Dörwald, Walter	walter at livinglogic.de
Dower, Steve	steve.dower at python.org
Drake, Fred L., Jr.	fred at fdrake.net
Dubner, Michael P.	dubnerm at mindless.com
Dubois, Paul F.	paul at pfdubois.com
Eby, Phillip J.	pje at telecommunity.com
Eby, P.J.	pje at telecommunity.com
Einat, Tal	taleinat at gmail.com
Elliott, Micah	mde at tracos.org
Epler, Jeff	jepler at unpythonic.net
Eppstein, David	eppstein at ics.uci.edu
Evans, Clark C.	cce at clarkevans.com
Ewing, Greg	greg.ewing at canterbury.ac.nz
Ewing, Gregory	greg.ewing at canterbury.ac.nz
Faassen, Martijn	faassen at infrae.com
Finney, Ben	ben+python at benfinney.id.au
Foord, Michael	michael at python.org
Furman, Ethan	ethan at stoneleaf.us
Galindo, Pablo	pablogsal at gmail.com
Ganssle, Paul	paul at ganssle.io
Gaynor, Alex	alex.gaynor at gmail.com
Gedam, Pradyun	pradyunsg at gmail.com
George, Damien
Giacometti, Frédéric B.	fred at arakne.com
Gilbert, Scott	xscottg at yahoo.com
Gonzalez, Ryan	rymg19 at gmail.com
Goodger, David	goodger at python.org
Griffin, Grant	g2 at iowegian.com
Haase, Mark E.	mehaase at gmail.com
Hammond, Mark	mhammond at skippinet.com.au
Harris, Peter	scav at blueyonder.co.uk
Hastings, Larry	larry at hastings.org
Heimes, Christian	christian at python.org
Heller, Thomas	theller at python.net
Hellmann, Doug	doug at doughellmann.com
Hetland, Magnus Lie	magnus at hetland.org
Hettinger, Raymond	python at rcn.com
Hodgson, Neil	neilh at scintilla.org
Holth, Daniel	dholth at gmail.com
House, Philip	phouse512 at gmail.com
Houtven, Laurens Van	_ at lvh.cc
Hoyt, Ben	benhoyt at gmail.com
Hrončok, Miro	miro at hroncok.cz
Hudson, Michael	mwh at python.net
Hylton, Jeremy	jeremy at alum.mit.edu
III, Ernest W. Durbin	ewdurbin at gmail.com
Ingram, Dustin	di at python.org
Ishimoto, Atsuo	ishimoto--at--gembook.org
Jansen, Jack	jack at cwi.nl
Jerdonek, Chris	chris.jerdonek at gmail.com
Jevnik, Joseph	joejev at gmail.com
Jewett, Jim	jimjjewett at gmail.com
Jewett, Jim J.	jimjjewett at gmail.com
Jodlowska, Ewa	ewa at python.org
Jones, Richard	richard at python.org
Kashin, Konstantin	kkashin at fb.com
Kleckner, Reid	rnk at mit.edu
Kluyver, Thomas	thomas at kluyver.me.uk
Koltsov, Stepan	yozh at mx1.ru
Krah, Stefan	skrah at bytereef.org
Kreft, Sebastian	skreft at deezer.com
Krekel, Holger	holger at merlinux.eu
Kuchling, A.M.	amk at amk.ca
Kuppusamy, Trishank Karthik	karthik at trishank.com
Kuska, Robert	rkuska at redhat.com
Landau, Joshua	joshua at landau.ws
Langa, Łukasz	lukasz at python.org
Lee, Michael	michael.lee.0x2a at gmail.com
Lehtosalo, Jukka	jukka.lehtosalo at iki.fi
Lemburg, Marc-André	mal at lemburg.com
Levkivskyi, Ivan	levkivskyi at gmail.com
Lielens, Gregory	gregory.lielens at fft.be
Lindqvist, Björn	bjourne at gmail.com
Lock, Joshua	jlock at vmware.com
von Löwis, Martin	martin at v.loewis.de
v. Löwis, Martin	martin at v.loewis.de
Lownds, Tony	tony at lownds.com
Mariatta	mariatta at python.org
Martelli, Alex	aleaxit at gmail.com
Martinot-Lagarde, Joseph
Mastrodomenico, Lino	l.mastrodomenico at gmail.com
Maupin, Patrick	pmaupin at gmail.com
McClelland, Andrew	eternalsquire at comcast.net
McCreary, Charles R.
McDonough, Chris	chrism at plope.com
McGibbon, Robert T.	rmcgibbo at gmail.com
McMillan, Gordon	gmcm at hypernet.com
McNamara, Andrew	andrewm at object-craft.com.au
Melotti, Ezio	ezio.melotti at gmail.com
Mendoza, Mark	mendoza.mark.a at gmail.com
Meskanen, Markus	markusmeskanen at gmail.com
Meyer, Mike	mwm at mired.org
Meyer, Carl	carl at oddbird.net
Mick, Trent	trentm at activestate.com
Miller, Mike G.
Montanaro, Skip	skip at pobox.com
Moody, Peter	pmoody at google.com
Moore, Paul	p.f.moore at gmail.com
Moore, Marina	mm9693 at nyu.edu
Murray, R David
Naoki, Inada	songofacandy at gmail.com
Natali, Charles-François	cf.natali at gmail.com
Nikolaou, Lysandros	lisandrosnik at gmail.com
Noller, Jesse	jnoller at gmail.com
North, Ben	ben at redfrontdoor.org
Norwitz, Neal	nnorwitz at gmail.com
Ochtman, Dirkjan	dirkjan at ochtman.nl
Oliphant, Travis	oliphant at ee.byu.edu
Orendorff, Jason	jason.orendorff at gmail.com
Orsava, Tomáš	tomas.n at orsava.cz
Oudkerk, Richard	r.m.oudkerk at googlemail.com
Oussoren, Ronald	ronaldoussoren at mac.com
Palard, Julien	julien at palard.fr
Pedroni, Samuele	pedronis at python.org
Peksag, Berker	berker.peksag at gmail.com
Pelletier, Michel	michel at users.sourceforge.net
Peters, Tim	tim.peters at gmail.com
Peterson, Benjamin	benjamin at python.org
Petrone, Jason	jp at demonseed.net
Pitrou, Antoine	solipsis at pitrou.net
Plch, Marcel	gmarcel.plch at gmail.com
Polley, James	jp at jamezpolley.com
PRADOS, Philippe	python at prados.fr
Pranskevichus, Elvis	elvis at edgedb.com
Prescod, Paul	paul at prescod.net
Pruitt, (James) Eric
Puehringer, Lukas	lukas.puehringer at nyu.edu
Quinlan, Brian	brian at sweetapp.com
Reedy, Terry	tjreedy at udel.edu
Regebro, Lennart	regebro at gmail.com
Reifschneider, Sean	jafo-pep at tummy.com
Reis, Christian R.	kiko at async.com.br
Riehl, Jonathan	jriehl at spaceship.com
Roach, Lisa	lisaroach14 at gmail.com
Roberge, Andre	andre.roberge at gmail.com
Ronacher, Armin	armin.ronacher at active-4.com
van Rossum, Guido (GvR)	guido at python.org
van Rossum, Just (JvR)	just at letterror.com
Rovito, Todd	rovitotv at gmail.com
Ryan, Lie	lie.1296 at gmail.com
Sajip, Vinay	vinay_sajip at red-dove.com
Salgado, Pablo Galindo	pablogsal at gmail.com
Schemenauer, Neil	nas at arctrix.com
Schneider-Kamp, Peter	nowonder at nowonder.de
Schofield, Ed	ed at pythoncharmers.com
Selivanov, Yury	yury at edgedb.com
Seo, Jiwon	seojiwon at gmail.com
Shannon, Mark	mark at hotpy.org
Simpson, Cameron	cs at cskk.id.au
Slodkowicz, Greg	jergosh at gmail.com
Smith, Kevin D.	kevin.smith at themorgue.org
Smith, Eric V.	eric at trueblade.com
Smith, Nathaniel J.	njs at pobox.com
Smith, Nathaniel	njs at pobox.com
Smith, Ethan	ethan at ethanhs.me
Smith, Gregory P.	greg at krypto.org
Snow, Eric	ericsnowcurrently at gmail.com
Spealman, Calvin	ironfroggy at gmail.com
Staley, Kerrick	mail at kerrickstaley.com
Stein, Greg	gstein at lyra.org
Stinner, Victor	vstinner at python.org
Storchaka, Serhiy
Stufft, Donald	donald at stufft.io
Stutzbach, Daniel	daniel at stutzbachenterprises.com
Sullivan, Michael J.	sully at msully.net
Suzi, Roman	rnd at onego.ru
Sweeney, Dennis	sweeney.dennis650 at gmail.com
Talin	viridia at gmail.com
Taschuk, Steven	staschuk at telusplanet.net
Taskaya, Batuhan
Teichmann, Martin	lkb.teichmann at gmail.com
Thomas, Geoffrey	geofft at ldpreload.com
Tirosh, Oren	oren at hishome.net
Turnbull, Stephen J.	stephen at xemacs.org
Urban, Daniel	urban.dani+py at gmail.com
Varoquaux, Till	till at fb.com
Vassalotti, Alexandre	alexandre at peadrop.com
Verdone, Mike	mike.verdone at gmail.com
Viehland, Dino	dinov at microsoft.com
Viktorin, Petr	encukou at gmail.com
Ware, Zachary	zachary.ware at gmail.com
Warnes, Gregory R.	gregory_r_warnes at groton.pfizer.com
Warsaw, Barry	barry at python.org
Way, Terence	terry at wayforward.net
Weele, Eric N. Vander	ericvw at gmail.com
Wells, Cliff	logiplexsoftware at earthlink.net
Whitley, Jervis	jervisau at gmail.com
Williams, Mark	mrw at enotuniq.org
Willing, Carol	willingc at gmail.com
Wilson, Greg	gvwilson at ddj.com
Winter, Collin	collinwinter at google.com
Wouters, Thomas	thomas at python.org
Yamamoto, Masayuki
Yasskin, Jeffrey	jyasskin at google.com
Yee, Ka-Ping	ping at zesty.ca
Zadka, Moshe	moshez at zadka.site.co.il
Zevenhoven, Koos	k7hoven at gmail.com
Zhu, Huaiyu	hzhu at users.sourceforge.net
Zhu, Shannon	szhu at fb.com
Ziadé, Tarek	tarek at ziade.org

References

[1]	PEP 1: PEP Purpose and Guidelines

[2]	View PEP history online: https://github.com/python/peps