python-peps/pep-0291.txt

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PEP: 291
Title: Backward Compatibility for Standard Library
Version: $Revision$
Last-Modified: $Date$
Author: neal@metaslash.com (Neal Norwitz)
Status: Active
Type: Informational
Created: 06-Jun-2002
Post-History:
Python-Version: 2.3
Abstract
This PEP describes the packages and modules in the standard
library which should remain backward compatible with previous
versions of Python.
Rationale
Authors have various reasons why packages and modules should
continue to work with previous versions of Python. In order to
maintain backward compatibility for these modules while moving the
rest of the standard library forward, it is necessary to know
which modules can be modified and which should use old and
possibly deprecated features.
Generally, authors should attempt to keep changes backward
compatible with the previous released version of Python in order
to make bug fixes easier to backport.
In addition to a package or module being listed in this PEP,
authors must add a comment at the top of each file documenting
the compatibility requirement.
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Features to Avoid
The following list contains common features to avoid in order
to maintain backward compatibility with each version of Python.
This list is not complete! It is only meant as a general guide.
Note that the features below were implemented in the version
following the one listed. For example, features listed next to
1.5.2 were implemented in 2.0.
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Version Features to Avoid
------- -----------------
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1.5.2 string methods, Unicode, list comprehensions,
augmented assignment (eg, +=), zip(), import x as y,
dict.setdefault(), print >> f, calling f(*args, **kw),
plus all features below
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2.0 nested scopes, rich comparisons, function attributes,
plus all features below
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2.1 use of object or new-style classes, iterators,
using generators, nested scopes, or //
without from __future__ import ... statement,
plus all features below
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2.2 bool, True, False, basestring, enumerate(), {}.pop(),
PendingDeprecationWarning, Universal Newlines
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Backward Compatible Packages, Modules, and Tools
Package/Module Maintainer(s) Python Version
-------------- ------------- --------------
bsddb Barry Warsaw 2.1
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compiler Jeremy Hylton 2.1
distutils Andrew Kuchling 1.5.2
email Barry Warsaw 2.1
logging Vinay Sajip 1.5.2
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sre Fredrik Lundh 1.5.2
xml (PyXML) Martin v. Loewis 2.0
xmlrpclib Fredrik Lundh 1.5.2
Tool Maintainer(s) Python Version
---- ------------- --------------
None
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Copyright
This document has been placed in the public domain.
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