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PEP 4: convert to reST, update SourceForge -> bugs.python.org, update DeprecationWarning policy 

and add removal of code using the module.

Closes #8090.
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Georg Brandl 2013-10-12 18:11:53 +02:00
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@ -5,90 +5,99 @@ Last-Modified: $Date$
Author: Martin von Löwis <martin@v.loewis.de> Author: Martin von Löwis <martin@v.loewis.de>
Status: Active Status: Active
Type: Process Type: Process
Content-Type: text/x-rst
Created: 1-Oct-2000 Created: 1-Oct-2000
Post-History: Post-History:
Introduction Introduction
============
When new modules were added to the standard Python library in the When new modules were added to the standard Python library in the
past, it was not possible to foresee whether they would still be past, it was not possible to foresee whether they would still be
useful in the future. Even though Python "Comes With Batteries useful in the future. Even though Python "Comes With Batteries
Included", batteries may discharge over time. Carrying old Included", batteries may discharge over time. Carrying old modules
modules around is a burden on the maintainer, especially when around is a burden on the maintainer, especially when there is no
there is no interest in the module anymore. interest in the module anymore.
At the same time, removing a module from the distribution is At the same time, removing a module from the distribution is
difficult, as it is not known in general whether anybody is still difficult, as it is not known in general whether anybody is still
using it. This PEP defines a procedure for removing modules from using it. This PEP defines a procedure for removing modules from the
the standard Python library. Usage of a module may be standard Python library. Usage of a module may be 'deprecated', which
`deprecated', which means that it may be removed from a future means that it may be removed from a future Python release. The
Python release. The rationale for deprecating a module is also rationale for deprecating a module is also collected in this PEP. If
collected in this PEP. If the rationale turns out faulty, the the rationale turns out faulty, the module may become 'undeprecated'.
module may become `undeprecated'.
Procedure for declaring a module deprecated Procedure for declaring a module deprecated
===========================================
Since the status of module deprecation is recorded in this PEP, Since the status of module deprecation is recorded in this PEP,
proposals for deprecating modules MUST be made by providing a proposals for deprecating modules MUST be made by providing a change
change to the text of this PEP, which SHOULD be a patch posted to to the text of this PEP, which SHOULD be a patch posted to
SourceForge, or sent by mail to the author of this PEP. bugs.python.org.
A proposal for deprecation of the module MUST include the date of A proposal for deprecation of the module MUST include the date of the
the proposed deprecation and a rationale for deprecating it. In proposed deprecation and a rationale for deprecating it. In addition,
addition, the proposal MUST include a change to the documentation the proposal MUST include a change to the documentation of the module;
of the module; deprecation is indicated by saying that the module deprecation is indicated by saying that the module is "obsolete" or
is "obsolete" or "deprecated". The proposal MAY include a patch "deprecated". The proposal SHOULD include a patch for the module's
for the module's source code to indicate deprecation there as source code to indicate deprecation there as well, by raising a
well. DeprecationWarning. The proposal MUST include patches to remove any
use of the deprecated module from the standard library.
It is expected that deprecated modules are included in the Python It is expected that deprecated modules are included in the Python
releases that immediately follows the deprecation; later releases releases that immediately follows the deprecation; later releases may
may ship without the deprecated modules. ship without the deprecated modules.
Procedure for declaring a module undeprecated Procedure for declaring a module undeprecated
=============================================
When a module becomes deprecated, a rationale is given for its When a module becomes deprecated, a rationale is given for its
deprecation. In some cases, an alternative interface for the same deprecation. In some cases, an alternative interface for the same
functionality is provided, so the old interface is deprecated. In functionality is provided, so the old interface is deprecated. In
other cases, the need for having the functionality of the module other cases, the need for having the functionality of the module may
may not exist anymore. not exist anymore.
If the rationale is faulty, again a change to this PEP's text MUST If the rationale is faulty, again a change to this PEP's text MUST be
be submitted. This change MUST include the date of undeprecation submitted. This change MUST include the date of undeprecation and a
and a rationale for undeprecation. Modules that are undeprecated rationale for undeprecation. Modules that are undeprecated under this
under this procedure MUST be listed in this PEP for at least one procedure MUST be listed in this PEP for at least one major release of
major release of Python. Python.
Obsolete modules Obsolete modules
================
A number of modules are already listed as obsolete in the library A number of modules are already listed as obsolete in the library
documentation. These are listed here for completeness. documentation. These are listed here for completeness.
cl, sv, timing cl, sv, timing
All these modules have been declared as obsolete in Python 2.0, All these modules have been declared as obsolete in Python 2.0, some
some even earlier. even earlier.
The following obsolete modules were removed in Python 2.5: The following obsolete modules were removed in Python 2.5:
addpack, cmp, cmpcache, codehack, dircmp, dump, find, fmt, addpack, cmp, cmpcache, codehack, dircmp, dump, find, fmt,
grep, lockfile, newdir, ni, packmail, Para, poly, grep, lockfile, newdir, ni, packmail, Para, poly,
rand, reconvert, regex, regsub, statcache, tb, tzparse, rand, reconvert, regex, regsub, statcache, tb, tzparse,
util, whatsound, whrandom, zmod util, whatsound, whrandom, zmod
The following modules were removed in Python 2.6: The following modules were removed in Python 2.6:
gopherlib, rgbimg, macfs gopherlib, rgbimg, macfs
The following modules currently lack a DeprecationWarning: The following modules currently lack a DeprecationWarning:
rfc822, mimetools, multifile rfc822, mimetools, multifile
Deprecated modules Deprecated modules
==================
::
Module name: posixfile Module name: posixfile
Rationale: Locking is better done by fcntl.lockf(). Rationale: Locking is better done by fcntl.lockf().
@ -251,19 +260,31 @@ Deprecated modules
Deprecation of modules removed in Python 3.0 Deprecation of modules removed in Python 3.0
============================================
PEP 3108 lists all modules that have been removed from Python 3.0. PEP 3108 lists all modules that have been removed from Python 3.0.
They all are documented as deprecated in Python 2.6, and raise a They all are documented as deprecated in Python 2.6, and raise a
DeprecationWarning if the -3 flag is activated. DeprecationWarning if the -3 flag is activated.
Undeprecated modules Undeprecated modules
====================
None. None.
Copyright
=========
This document has been placed in the public domain.
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