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Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001+++++++++++
2Python News
3+++++++++++
4
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 Rossum0368b722007-05-11 16:50:42 +000029- PEP 3132 was accepted. That means that you can do ``a, *b = range(5)``
30 to assign 0 to a and [1, 2, 3, 4] to b.
31
Guido van Rossum805365e2007-05-07 22:24:25 +000032- range() now returns an iterator rather than a list. Floats are not allowed.
33 xrange() is no longer defined.
34
Guido van Rossumd8faa362007-04-27 19:54:29 +000035- Merged from (2.6) trunk at r54987.
36
Nick Coghlan650f0d02007-04-15 12:05:43 +000037- Patch #1660500: hide iteration variable in list comps, add set comps
38 and use common code to handle compilation of iterative expressions
39
Guido van Rossume27dc722007-03-27 22:37:34 +000040- By default, != returns the opposite of ==, unless the latter returns
41 NotImplemented.
42
Collin Winter670e6922007-03-21 02:57:17 +000043- Patch #1680961: sys.exitfunc has been removed and replaced with a private
44 C-level API.
45
Georg Brandl801dd732007-03-18 20:18:31 +000046- PEP 3115: new metaclasses: the metaclass is now specified as a
47 keyword arg in the class statement, which can now use the full syntax of
48 a parameter list. Also, the metaclass can implement a __prepare__ function
49 which will be called to create the dictionary for the new class namespace.
50
Georg Brandl428f0642007-03-18 18:35:15 +000051- The long-deprecated argument "pend" of PyFloat_FromString() has been
52 removed.
53
Georg Brandle32b4222007-03-10 22:13:27 +000054- The dir() function has been extended to call the __dir__() method on
55 its argument, if it exists. If not, it will work like before. This allows
56 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +000057
Georg Brandle32b4222007-03-10 22:13:27 +000058- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +000059
Georg Brandle32b4222007-03-10 22:13:27 +000060- Removed the exceptions module, all the exceptions are already builtin.
61
62- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +000063 functionality formerly known as raw_input(); the name raw_input()
64 is no longer defined.
65
Brett Cannon39590462007-02-26 22:01:14 +000066- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +000067
Guido van Rossumcc2b0162007-02-11 06:12:03 +000068- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
69 and .keys(), .items(), .values() return dict views.
70
Guido van Rossum8b545362007-02-09 23:52:14 +000071- PEP 3105: print is now a function. Also (not in the PEP) the
72 'softspace' attribute of files is now gone (since print() doesn't use
73 it). A side effect of this change is that you can get incomplete
74 output lines in interactive sessions:
75
76 >>> print(42, end="")
77 42>>>
78
79 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +000080
Brett Cannon398db8b2007-01-29 23:44:37 +000081- PEP 3102: keyword-only arguments.
82
Guido van Rossumd4588c12007-02-13 19:55:23 +000083- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +000084 and literals with trailing 'L' or 'l' have been removed.
85 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +000086
87- 'except E, V' must now be spelled as 'except E as V' and deletes V
88 at the end of the except clause; V must be a simple name.
89
Neal Norwitzc1505362006-12-28 06:47:50 +000090- Added function annotations per PEP 3107.
91
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +000092- Added nonlocal declaration from PEP 3104
93
94 >>> def f(x):
95 ... def inc():
96 ... nonlocal x
97 ... x += 1
98 ... return x
99 ... return inc
100 ...
101 >>> inc = f(0)
102 >>> inc()
103 1
104 >>> inc()
105 2
106
Georg Brandl66a796e2006-12-19 20:50:34 +0000107- Moved intern() to sys.intern().
108
109- exec is now a function.
110
111- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000112
Neal Norwitz4886cc32006-08-21 17:06:07 +0000113- Classic classes are a thing of the past. All classes are new style.
114
115- Exceptions *must* derive from BaseException.
116
117- Integer division always returns a float. The -Q option is no more.
118 All the following are gone:
119 * PyNumber_Divide and PyNumber_InPlaceDivide
120 * __div__, __rdiv__, and __idiv__
121 * nb_divide, nb_inplace_divide
122 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
123 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
124 if we want to re-use __div__ and friends. If we do, it will make
125 it harder to write code for both 2.x and 3.x.)
126
127- 'as' and 'with' are keywords.
128
129- Absolute import is the default behavior for 'import foo' etc.
130
Neal Norwitz378b2c92006-08-29 07:57:22 +0000131- Removed support for syntax:
132 backticks (`x`), <>
133
Neal Norwitz4886cc32006-08-21 17:06:07 +0000134- Removed these Python builtins:
Neal Norwitz81fe3412007-02-26 21:42:55 +0000135 apply(), coerce()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000136
Neal Norwitz378b2c92006-08-29 07:57:22 +0000137- Removed these Python methods:
138 {}.has_key
139
Neal Norwitz4886cc32006-08-21 17:06:07 +0000140- Removed these Python slots:
141 __coerce__, __div__, __idiv__, __rdiv__
142
143- Removed these attributes from Python modules:
144 * operator module: div, idiv, __div__, __idiv__
145
Neal Norwitz4886cc32006-08-21 17:06:07 +0000146- Removed these C APIs:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000147 PyNumber_Coerce(), PyNumber_CoerceEx()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000148
149- Removed these C slots/fields:
150 nb_divide, nb_inplace_divide
151
152- Removed these macros:
153 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
154
155- Removed these typedefs:
156 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
157 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc
158
159- Removed these opcodes:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000160 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
161
162- zip returns an iterator
163
164- Additions:
Georg Brandl66a796e2006-12-19 20:50:34 +0000165 set literals, ellipsis literal
Neal Norwitz378b2c92006-08-29 07:57:22 +0000166
Neal Norwitz4886cc32006-08-21 17:06:07 +0000167
168Extension Modules
169-----------------
170
Collin Winter390d29c2007-03-21 20:10:51 +0000171- isCallable() and sequenceIncludes() have been removed from the operator
172 module.
173
174
Neal Norwitz4886cc32006-08-21 17:06:07 +0000175Library
176-------
177
Guido van Rossum0368b722007-05-11 16:50:42 +0000178- Remove obsolete IRIX modules: al, cd, cl, fl, fm, gl, imgfile, sgi, sv.
179
180- Remove bsddb185 module it was obsolete.
181
182- Remove commands.getstatus() it was obsolete.
183
Guido van Rossum805365e2007-05-07 22:24:25 +0000184- Remove functions in string and strop modules that are also string methods.
Neal Norwitz9d72bb42007-04-17 08:48:32 +0000185
186- Remove obsolete modules: xmllib, stringold.
187
188- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
189
190- Remove xmlrpclib.SlowParser. It was based on xmllib.
191
Collin Winter670e6922007-03-21 02:57:17 +0000192- Patch #1680961: atexit has been reimplemented in C.
193
Guido van Rossum893523e2007-01-10 01:29:06 +0000194- Removed all traces of the sets module.
195
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000196Build
197-----
198
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000199C API
200-----
201
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000202Tests
203-----
204
Brett Cannonced04e02005-02-13 22:53:22 +0000205Documentation
206-------------
207
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000208Mac
209---
210
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000211New platforms
212-------------
213
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000214Tools/Demos
215-----------
216
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000217**(For information about older versions, consult the HISTORY file.)**
Neal Norwitz6cb726a2007-05-07 06:59:22 +0000218