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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 Rossumcd16bf62007-06-13 18:07:49 +000029- Removed the __oct__ and __hex__ special methods and added a bin()
30 builtin function.
31
32- PEP 3127: octal literals now start with "0o". Old-style octal literals
33 are invalid. There are binary literals with a prefix of "0b".
34 This also affects int(x, 0).
35
Guido van Rossume7ba4952007-06-06 23:52:48 +000036- None, True, False are now keywords.
37
Guido van Rossum29478ef2007-05-29 00:39:44 +000038- PEP 3119: isinstance() and issubclass() can be overridden.
39
Guido van Rossumebe3e162007-05-17 18:20:34 +000040- Remove BaseException.message.
41
Guido van Rossum1bc535d2007-05-15 18:46:22 +000042- Remove tuple parameter unpacking (PEP 3113).
43
Guido van Rossuma8add0e2007-05-14 22:03:55 +000044- Remove the f_restricted attribute from frames. This naturally leads to teh
45 removal of PyEval_GetRestricted() and PyFrame_IsRestricted().
46
Guido van Rossum0368b722007-05-11 16:50:42 +000047- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
48 to assign 0 to a and [1, 2, 3, 4] to b.
49
Guido van Rossum805365e2007-05-07 22:24:25 +000050- range() now returns an iterator rather than a list. Floats are not allowed.
51 xrange() is no longer defined.
52
Nick Coghlan650f0d02007-04-15 12:05:43 +000053- Patch #1660500: hide iteration variable in list comps, add set comps
54 and use common code to handle compilation of iterative expressions
55
Guido van Rossume27dc722007-03-27 22:37:34 +000056- By default, != returns the opposite of ==, unless the latter returns
57 NotImplemented.
58
Collin Winter670e6922007-03-21 02:57:17 +000059- Patch #1680961: sys.exitfunc has been removed and replaced with a private
60 C-level API.
61
Georg Brandl801dd732007-03-18 20:18:31 +000062- PEP 3115: new metaclasses: the metaclass is now specified as a
63 keyword arg in the class statement, which can now use the full syntax of
64 a parameter list. Also, the metaclass can implement a __prepare__ function
65 which will be called to create the dictionary for the new class namespace.
66
Georg Brandl428f0642007-03-18 18:35:15 +000067- The long-deprecated argument "pend" of PyFloat_FromString() has been
68 removed.
69
Georg Brandle32b4222007-03-10 22:13:27 +000070- The dir() function has been extended to call the __dir__() method on
71 its argument, if it exists. If not, it will work like before. This allows
72 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +000073
Georg Brandle32b4222007-03-10 22:13:27 +000074- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +000075
Georg Brandle32b4222007-03-10 22:13:27 +000076- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +000077 functionality formerly known as raw_input(); the name raw_input()
78 is no longer defined.
79
Brett Cannon39590462007-02-26 22:01:14 +000080- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +000081
Guido van Rossumcc2b0162007-02-11 06:12:03 +000082- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
83 and .keys(), .items(), .values() return dict views.
84
Guido van Rossum8b545362007-02-09 23:52:14 +000085- PEP 3105: print is now a function. Also (not in the PEP) the
86 'softspace' attribute of files is now gone (since print() doesn't use
87 it). A side effect of this change is that you can get incomplete
88 output lines in interactive sessions:
89
90 >>> print(42, end="")
91 42>>>
92
93 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +000094
Brett Cannon398db8b2007-01-29 23:44:37 +000095- PEP 3102: keyword-only arguments.
96
Guido van Rossumd4588c12007-02-13 19:55:23 +000097- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +000098 and literals with trailing 'L' or 'l' have been removed.
99 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +0000100
101- 'except E, V' must now be spelled as 'except E as V' and deletes V
102 at the end of the except clause; V must be a simple name.
103
Neal Norwitzc1505362006-12-28 06:47:50 +0000104- Added function annotations per PEP 3107.
105
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +0000106- Added nonlocal declaration from PEP 3104
107
108 >>> def f(x):
109 ... def inc():
110 ... nonlocal x
111 ... x += 1
112 ... return x
113 ... return inc
114 ...
115 >>> inc = f(0)
116 >>> inc()
117 1
118 >>> inc()
119 2
120
Georg Brandl66a796e2006-12-19 20:50:34 +0000121- Moved intern() to sys.intern().
122
123- exec is now a function.
124
125- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000126
Neal Norwitz4886cc32006-08-21 17:06:07 +0000127- Classic classes are a thing of the past. All classes are new style.
128
129- Exceptions *must* derive from BaseException.
130
131- Integer division always returns a float. The -Q option is no more.
132 All the following are gone:
133 * PyNumber_Divide and PyNumber_InPlaceDivide
134 * __div__, __rdiv__, and __idiv__
135 * nb_divide, nb_inplace_divide
136 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
137 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
138 if we want to re-use __div__ and friends. If we do, it will make
139 it harder to write code for both 2.x and 3.x.)
140
141- 'as' and 'with' are keywords.
142
143- Absolute import is the default behavior for 'import foo' etc.
144
Neal Norwitz378b2c92006-08-29 07:57:22 +0000145- Removed support for syntax:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000146 backticks (ie, `x`), <>
Neal Norwitz378b2c92006-08-29 07:57:22 +0000147
Neal Norwitz4886cc32006-08-21 17:06:07 +0000148- Removed these Python builtins:
Guido van Rossume7ba4952007-06-06 23:52:48 +0000149 apply(), callable(), coerce(), file(), reduce(), reload()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000150
Neal Norwitz378b2c92006-08-29 07:57:22 +0000151- Removed these Python methods:
152 {}.has_key
153
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000154- Removed these opcodes:
155 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
156
157- Remove C API support for restricted execution.
158
159- zip returns an iterator
160
161- Additions:
162 set literals, ellipsis literal
163
164- Added class decorators per PEP 3129.
165
166
167Extension Modules
168-----------------
169
170- Remove the imageop module. Obsolete long with its unit tests becoming
171 useless from the removal of rgbimg and imgfile.
Neal Norwitz4886cc32006-08-21 17:06:07 +0000172
173- Removed these attributes from Python modules:
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000174 * operator module: div, idiv, __div__, __idiv__, isCallable, sequenceIncludes
Guido van Rossume7ba4952007-06-06 23:52:48 +0000175 * sys module: exc_clear(), exc_type, exc_value, exc_traceback
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000176
177
178Library
179-------
180
181- Remove the compiler package. Use of the _ast module and (an eventual)
182 AST -> bytecode mechanism.
183
184- Removed these modules:
Guido van Rossume7ba4952007-06-06 23:52:48 +0000185 * Bastion, bsddb185, exceptions, md5, MimeWriter, mimify, popen2, rexec,
186 sets, sha, stringold, strop, timing, xmllib.
Guido van Rossumd59da4b2007-05-22 18:11:13 +0000187
188- Remove obsolete IRIX modules: al/AL, cd/CD, cddb, cdplayer, cl/CL, DEVICE,
189 ERRNO, FILE, fl/FL, flp, fm, GET, gl/GL, GLWS, IN, imgfile, IOCTL, jpeg,
190 panel, panelparser, readcd, sgi, sv/SV, torgb, WAIT.
191
192- Remove obsolete functions:
193 * commands.getstatus(), os.popen*,
194
195- Remove functions in the string module that are also string methods.
196
197- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
198
199- Remove xmlrpclib.SlowParser. It was based on xmllib.
200
201- Patch #1680961: atexit has been reimplemented in C.
202
203
204Build
205-----
206
207C API
208-----
209
210- Removed these Python slots:
211 __coerce__, __div__, __idiv__, __rdiv__
Neal Norwitz4886cc32006-08-21 17:06:07 +0000212
Neal Norwitz4886cc32006-08-21 17:06:07 +0000213- Removed these C APIs:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000214 PyNumber_Coerce(), PyNumber_CoerceEx()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000215
216- Removed these C slots/fields:
217 nb_divide, nb_inplace_divide
218
219- Removed these macros:
220 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
221
222- Removed these typedefs:
223 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
224 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc
225
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000226
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000227Tests
228-----
229
Brett Cannonced04e02005-02-13 22:53:22 +0000230Documentation
231-------------
232
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000233Mac
234---
235
Guido van Rossume7ba4952007-06-06 23:52:48 +0000236- The cfmfile was removed.
237
238
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000239New platforms
240-------------
241
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000242Tools/Demos
243-----------
244
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000245**(For information about older versions, consult the HISTORY file.)**
Neal Norwitz6cb726a2007-05-07 06:59:22 +0000246