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Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001+++++++++++
2Python News
3+++++++++++
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Anthony Baxterb0c66302004-11-04 05:23:17 +00005(editors: check NEWS.help for information about editing NEWS using ReST.)
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Guido van Rossum45aecf42006-03-15 04:58:47 +00007What's New in Python 3000?
8==========================
Thomas Wouters4d70c3d2006-06-08 14:42:34 +00009
Neal Norwitz4886cc32006-08-21 17:06:07 +000010*Release date: XX-XXX-200X*
11
12TO DO
13-----
14
Georg Brandl66a796e2006-12-19 20:50:34 +000015- See PEP 3000, 3100.
Neal Norwitz4886cc32006-08-21 17:06:07 +000016
Neal Norwitz4886cc32006-08-21 17:06:07 +000017- Weed really old/weird stuff from the library.
18
Guido van Rossumd8faa362007-04-27 19:54:29 +000019- Use io.py instead of C stdio everywhere.
Neal Norwitz4886cc32006-08-21 17:06:07 +000020
Guido van Rossum805365e2007-05-07 22:24:25 +000021- Make strings all Unicode (see branches/py3k-struni).
Neal Norwitz4886cc32006-08-21 17:06:07 +000022
Neal Norwitz4886cc32006-08-21 17:06:07 +000023- Get rid of various compatibility-related flags (e.g. division flags).
24
Neal Norwitz378b2c92006-08-29 07:57:22 +000025
Neal Norwitz4886cc32006-08-21 17:06:07 +000026Core and Builtins
27-----------------
28
Guido van Rossumebe3e162007-05-17 18:20:34 +000029- Remove BaseException.message.
30
Guido van Rossum1bc535d2007-05-15 18:46:22 +000031- Remove tuple parameter unpacking (PEP 3113).
32
Guido van Rossuma8add0e2007-05-14 22:03:55 +000033- Remove the f_restricted attribute from frames. This naturally leads to teh
34 removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
35
Guido van Rossum0368b722007-05-11 16:50:42 +000036- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
37 to assign 0 to a and [1, 2, 3, 4] to b.
38
Guido van Rossum805365e2007-05-07 22:24:25 +000039- range() now returns an iterator rather than a list. Floats are not allowed.
40 xrange() is no longer defined.
41
Nick Coghlan650f0d02007-04-15 12:05:43 +000042- Patch #1660500: hide iteration variable in list comps, add set comps
43 and use common code to handle compilation of iterative expressions
44
Guido van Rossume27dc722007-03-27 22:37:34 +000045- By default, != returns the opposite of ==, unless the latter returns
46 NotImplemented.
47
Collin Winter670e6922007-03-21 02:57:17 +000048- Patch #1680961: sys.exitfunc has been removed and replaced with a private
49 C-level API.
50
Georg Brandl801dd732007-03-18 20:18:31 +000051- PEP 3115: new metaclasses: the metaclass is now specified as a
52 keyword arg in the class statement, which can now use the full syntax of
53 a parameter list. Also, the metaclass can implement a __prepare__ function
54 which will be called to create the dictionary for the new class namespace.
55
Georg Brandl428f0642007-03-18 18:35:15 +000056- The long-deprecated argument "pend" of PyFloat_FromString() has been
57 removed.
58
Georg Brandle32b4222007-03-10 22:13:27 +000059- The dir() function has been extended to call the __dir__() method on
60 its argument, if it exists. If not, it will work like before. This allows
61 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +000062
Georg Brandle32b4222007-03-10 22:13:27 +000063- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +000064
Georg Brandle32b4222007-03-10 22:13:27 +000065- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +000066 functionality formerly known as raw_input(); the name raw_input()
67 is no longer defined.
68
Brett Cannon39590462007-02-26 22:01:14 +000069- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +000070
Guido van Rossumcc2b0162007-02-11 06:12:03 +000071- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
72 and .keys(), .items(), .values() return dict views.
73
Guido van Rossum8b545362007-02-09 23:52:14 +000074- PEP 3105: print is now a function. Also (not in the PEP) the
75 'softspace' attribute of files is now gone (since print() doesn't use
76 it). A side effect of this change is that you can get incomplete
77 output lines in interactive sessions:
78
79 >>> print(42, end="")
80 42>>>
81
82 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +000083
Brett Cannon398db8b2007-01-29 23:44:37 +000084- PEP 3102: keyword-only arguments.
85
Guido van Rossumd4588c12007-02-13 19:55:23 +000086- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +000087 and literals with trailing 'L' or 'l' have been removed.
88 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +000089
90- 'except E, V' must now be spelled as 'except E as V' and deletes V
91 at the end of the except clause; V must be a simple name.
92
Neal Norwitzc1505362006-12-28 06:47:50 +000093- Added function annotations per PEP 3107.
94
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +000095- Added nonlocal declaration from PEP 3104
96
97 >>> def f(x):
98 ... def inc():
99 ... nonlocal x
100 ... x += 1
101 ... return x
102 ... return inc
103 ...
104 >>> inc = f(0)
105 >>> inc()
106 1
107 >>> inc()
108 2
109
Georg Brandl66a796e2006-12-19 20:50:34 +0000110- Moved intern() to sys.intern().
111
112- exec is now a function.
113
114- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000115
Neal Norwitz4886cc32006-08-21 17:06:07 +0000116- Classic classes are a thing of the past. All classes are new style.
117
118- Exceptions *must* derive from BaseException.
119
120- Integer division always returns a float. The -Q option is no more.
121 All the following are gone:
122 * PyNumber_Divide and PyNumber_InPlaceDivide
123 * __div__, __rdiv__, and __idiv__
124 * nb_divide, nb_inplace_divide
125 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
126 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
127 if we want to re-use __div__ and friends. If we do, it will make
128 it harder to write code for both 2.x and 3.x.)
129
130- 'as' and 'with' are keywords.
131
132- Absolute import is the default behavior for 'import foo' etc.
133
Neal Norwitz378b2c92006-08-29 07:57:22 +0000134- Removed support for syntax:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000135 backticks (ie, `x`), <>
Neal Norwitz378b2c92006-08-29 07:57:22 +0000136
Neal Norwitz4886cc32006-08-21 17:06:07 +0000137- Removed these Python builtins:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000138 apply(), callable(), coerce(), file()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000139
Neal Norwitz378b2c92006-08-29 07:57:22 +0000140- Removed these Python methods:
141 {}.has_key
142
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000143- Removed these opcodes:
144 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
145
146- Remove C API support for restricted execution.
147
148- zip returns an iterator
149
150- Additions:
151 set literals, ellipsis literal
152
153- Added class decorators per PEP 3129.
154
155
156Extension Modules
157-----------------
158
159- Remove the imageop module. Obsolete long with its unit tests becoming
160 useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000161
162- Removed these attributes from Python modules:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000163 * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
164
165
166Library
167-------
168
169- Remove the compiler package. Use of the _ast module and (an eventual)
170 AST -> bytecode mechanism.
171
172- Removed these modules:
173 * Bastion, bsddb185, exceptions, md5, popen2, rexec,
174 sets, sha, stringold, strop, xmllib
175
176- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
177 ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
178 panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
179
180- Remove obsolete functions:
181 * commands.getstatus(), os.popen*,
182
183- Remove functions in the string module that are also string methods.
184
185- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
186
187- Remove xmlrpclib.SlowParser. It was based on xmllib.
188
189- Patch #1680961: atexit has been reimplemented in C.
190
191
192Build
193-----
194
195C API
196-----
197
198- Removed these Python slots:
199 __coerce__, __div__, __idiv__, __rdiv__
Neal Norwitz4886cc32006-08-21 17:06:07 +0000200
Neal Norwitz4886cc32006-08-21 17:06:07 +0000201- Removed these C APIs:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000202 PyNumber_Coerce(), PyNumber_CoerceEx()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000203
204- Removed these C slots/fields:
205 nb_divide, nb_inplace_divide
206
207- Removed these macros:
208 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
209
210- Removed these typedefs:
211 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
212 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc
213
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000214
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000215Tests
216-----
217
Brett Cannonced04e02005-02-13 22:53:22 +0000218Documentation
219-------------
220
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000221Mac
222---
223
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000224New platforms
225-------------
226
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000227Tools/Demos
228-----------
229
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000230**(For information about older versions, consult the HISTORY file.)**
Neal Norwitz6cb726a2007-05-07 06:59:22 +0000231