93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
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.
|
||
|
||
|
||
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 the features to avoid were implemented in the following
|
||
version. For example, features listed next to 1.5.2 were
|
||
implemented in 2.0.
|
||
|
||
Version Features
|
||
------- --------
|
||
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 2.0 features
|
||
|
||
2.0 nested scopes, rich comparisons, function attributes,
|
||
plus 2.1 features
|
||
|
||
2.1 use of object or new-style classes, iterators,
|
||
using generators, nested scopes, or //
|
||
without from __future__ import ... statement,
|
||
plus 2.2 features
|
||
|
||
2.2 bool, True, False, basestring, enumerate(), {}.pop(),
|
||
PendingDeprecationWarning, Universal Newlines,
|
||
plus 2.3 features
|
||
|
||
|
||
Backward Compatible Packages, Modules, and Tools
|
||
|
||
Package/Module Maintainer(s) Python Version
|
||
-------------- ------------- --------------
|
||
compiler Jeremy Hylton 2.1
|
||
distutils Andrew Kuchling 1.5.2
|
||
email Barry Warsaw 2.1
|
||
sre Fredrik Lundh 1.5.2
|
||
xml (PyXML) Martin v. Loewis 2.0
|
||
xmlrpclib Fredrik Lundh 1.5.2
|
||
|
||
|
||
Tool Maintainer(s) Python Version
|
||
---- ------------- --------------
|
||
scripts/freeze/modulefinder Thomas Heller 1.5.2
|
||
|
||
|
||
Copyright
|
||
|
||
This document has been placed in the public domain.
|
||
|
||
|
||
|
||
Local Variables:
|
||
mode: indented-text
|
||
indent-tabs-mode: nil
|
||
sentence-end-double-space: t
|
||
fill-column: 70
|
||
End:
|