This PEP, previously known as PEP 3000, describes smaller scale changes and new features for which no separate PEP is written yet, all targeted for Python 3000.
The list of features included in this document is subject to change and isn’t binding on the Python development community; features may be added, removed, and modified at any time. The purpose of this list is to focus our language development effort on changes that are steps to 3.0, and to encourage people to invent ways to smooth the transition.
This document is not a wish-list that anyone can extend. While there are two authors of this PEP, we’re just supplying the text; the decisions for which changes are listed in this document are made by Guido van Rossum, who has chosen them as goals for Python 3.0.
Guido’s pronouncements on things that will not change in Python 3.0 are recorded in PEP 3099.
General goalsA general goal is to reduce feature duplication by removing old ways of doing things. A general principle of the design will be that one obvious way of doing something is enough. [1]
Influencing PEPsexec as a statement is not worth it – make it a function [done]print by a function [14] PEP 3105 [done]softspace attribute of files goes away. [done]except E1, E2, E3 as err: if you want the error variable. [3] [done]None becomes a keyword [4]; also True and False [done]... to become a general expression element [16] [done]as becomes a keyword [5] (starting in 2.6 already) [done]list(); as a consequence the loop variable will no longer be exposed PEP 289 [done]== and != between disparate types will raise an exception unless explicitly supported by the type [6] [done]sys.modules (i.e., a value of None for A.string means to use the top-level string module) will not be supported.func_whatever will be renamed __whatever__ [17] [done]__nonzero__ special method will be renamed to __bool__ and have to return a bool. The typeobject slot will be called tp_bool [23] [done]To be removed:
raise Exception, "message": use raise Exception("message") [12] [done]x: use repr(x) [2] [done]<> operator: use != instead [3] [done]__oct__, __hex__: use __index__ in oct() and hex() instead. [done]__methods__ and __members__ [done]PyImport_ReloadModule ?
dict.keys(), dict.values(), dict.items(), etc.); iter* methods will be removed. [done]string.join() stringify its arguments? [18] [NO]To be removed:
basestring.find() and basestring.rfind(); use basestring.index() or basestring.[r]partition() or basestring.rindex() in a try/except block??? [13] [UNLIKELY]file.xreadlines() method [31] [done]dict.setdefault()? [15] [UNLIKELY]dict.has_key() method; use in operator [done]list.sort() and builtin.sorted() methods: eliminate cmp parameter [27] [done]range(), zip(), map(), filter(), etc.) [done]input() and rename raw_input() to input(). If you need the old input(), use eval(input()). [done]trunc(), which would call the __trunc__() method on its argument; suggested use is for objects like float where calling __int__() has data loss, but an integral representation is still desired? [8] [done]bin() function for a binary representation of integers [done]To be removed:
apply(): use f(*args, **kw) instead [2] [done]buffer(): must die (use a bytes() type instead) (?) [2] [done]callable(): just use isinstance(x, collections.Callable) (?) [2] [done]compile(): put in sys (or perhaps in a module of its own) [2]coerce(): no longer needed [2] [done]execfile(), reload(): use exec() [2] [done]intern(): put in sys [2], [22] [done]reduce(): put in functools, a loop is more readable most of the times [2], [9] [done]xrange(): use range() instead [1] [See range() above] [done]StandardError: this is a relic from the original exception hierarchy;
Exception instead. [done]
To be removed:
macfs [to do]new, reconvert, stringold, xmllib, pcre, pypcre, strop [all done]buildtools, mimetools, multifile, rfc822, [to do]mpz, posixfile, regsub, rgbimage, sha, statcache, sv, TERMIOS, timing [done]cfmfile, gopherlib, md5, MimeWriter, mimify [done]cl, sets, xreadlines, rotor, whrandom [done]Para, addpack, cmp, cmpcache, codehack, dircmp, dump, find, fmt, grep, lockfile, newdir, ni, packmail, poly, rand, statcache, tb, tzparse, util, whatsound, whrandom, zmodsys.exitfunc: use atexit module instead [28], [35] [done]sys.exc_type, sys.exc_values, sys.exc_traceback: not thread-safe; use sys.exc_info() or an attribute of the exception [2] [11] [28] [done]sys.exc_clear: Python 3’s except statements provide the same functionality [24] PEP 3110 [28] [done]array.read, array.write [30]operator.isCallable : callable() built-in is being removed [29] [36] [done]operator.sequenceIncludes : redundant thanks to operator.contains [29] [36] [done]This document has been placed in the public domain.
Source: https://github.com/python/peps/blob/main/peps/pep-3100.rst
Last modified: 2025-02-01 08:55:40 GMT
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4