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Skip Montanaroe5d7f7f2002-09-20 14:16:59 +00001+++++++++++
2Python News
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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?
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Thomas Wouters4d70c3d2006-06-08 14:42:34 +00009
Neal Norwitz4886cc32006-08-21 17:06:07 +000010*Release date: XX-XXX-200X*
11
12TO DO
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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
19- Unify range() and xrange().
20
Neal Norwitz4886cc32006-08-21 17:06:07 +000021- Rework the standard I/O library to use bytes for binary files.
22
23- Make strings all Unicode.
24
Neal Norwitz4886cc32006-08-21 17:06:07 +000025- Get rid of various compatibility-related flags (e.g. division flags).
26
Neal Norwitz378b2c92006-08-29 07:57:22 +000027
Neal Norwitz4886cc32006-08-21 17:06:07 +000028Core and Builtins
29-----------------
30
Nick Coghlan650f0d02007-04-15 12:05:43 +000031- Patch #1660500: hide iteration variable in list comps, add set comps
32 and use common code to handle compilation of iterative expressions
33
Guido van Rossume27dc722007-03-27 22:37:34 +000034- By default, != returns the opposite of ==, unless the latter returns
35 NotImplemented.
36
Collin Winter670e6922007-03-21 02:57:17 +000037- Patch #1680961: sys.exitfunc has been removed and replaced with a private
38 C-level API.
39
Georg Brandl801dd732007-03-18 20:18:31 +000040- PEP 3115: new metaclasses: the metaclass is now specified as a
41 keyword arg in the class statement, which can now use the full syntax of
42 a parameter list. Also, the metaclass can implement a __prepare__ function
43 which will be called to create the dictionary for the new class namespace.
44
Georg Brandl428f0642007-03-18 18:35:15 +000045- The long-deprecated argument "pend" of PyFloat_FromString() has been
46 removed.
47
Georg Brandle32b4222007-03-10 22:13:27 +000048- The dir() function has been extended to call the __dir__() method on
49 its argument, if it exists. If not, it will work like before. This allows
50 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +000051
Georg Brandle32b4222007-03-10 22:13:27 +000052- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +000053
Georg Brandle32b4222007-03-10 22:13:27 +000054- Removed the exceptions module, all the exceptions are already builtin.
55
56- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +000057 functionality formerly known as raw_input(); the name raw_input()
58 is no longer defined.
59
Brett Cannon39590462007-02-26 22:01:14 +000060- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +000061
Guido van Rossumcc2b0162007-02-11 06:12:03 +000062- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
63 and .keys(), .items(), .values() return dict views.
64
Guido van Rossum8b545362007-02-09 23:52:14 +000065- PEP 3105: print is now a function. Also (not in the PEP) the
66 'softspace' attribute of files is now gone (since print() doesn't use
67 it). A side effect of this change is that you can get incomplete
68 output lines in interactive sessions:
69
70 >>> print(42, end="")
71 42>>>
72
73 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +000074
Brett Cannon398db8b2007-01-29 23:44:37 +000075- PEP 3102: keyword-only arguments.
76
Guido van Rossumd4588c12007-02-13 19:55:23 +000077- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +000078 and literals with trailing 'L' or 'l' have been removed.
79 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +000080
81- 'except E, V' must now be spelled as 'except E as V' and deletes V
82 at the end of the except clause; V must be a simple name.
83
Neal Norwitzc1505362006-12-28 06:47:50 +000084- Added function annotations per PEP 3107.
85
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +000086- Added nonlocal declaration from PEP 3104
87
88 >>> def f(x):
89 ... def inc():
90 ... nonlocal x
91 ... x += 1
92 ... return x
93 ... return inc
94 ...
95 >>> inc = f(0)
96 >>> inc()
97 1
98 >>> inc()
99 2
100
Georg Brandl66a796e2006-12-19 20:50:34 +0000101- Moved intern() to sys.intern().
102
103- exec is now a function.
104
105- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000106
Neal Norwitz4886cc32006-08-21 17:06:07 +0000107- Classic classes are a thing of the past. All classes are new style.
108
109- Exceptions *must* derive from BaseException.
110
111- Integer division always returns a float. The -Q option is no more.
112 All the following are gone:
113 * PyNumber_Divide and PyNumber_InPlaceDivide
114 * __div__, __rdiv__, and __idiv__
115 * nb_divide, nb_inplace_divide
116 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
117 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
118 if we want to re-use __div__ and friends. If we do, it will make
119 it harder to write code for both 2.x and 3.x.)
120
121- 'as' and 'with' are keywords.
122
123- Absolute import is the default behavior for 'import foo' etc.
124
Neal Norwitz378b2c92006-08-29 07:57:22 +0000125- Removed support for syntax:
126 backticks (`x`), <>
127
Neal Norwitz4886cc32006-08-21 17:06:07 +0000128- Removed these Python builtins:
Neal Norwitz81fe3412007-02-26 21:42:55 +0000129 apply(), coerce()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000130
Neal Norwitz378b2c92006-08-29 07:57:22 +0000131- Removed these Python methods:
132 {}.has_key
133
Neal Norwitz4886cc32006-08-21 17:06:07 +0000134- Removed these Python slots:
135 __coerce__, __div__, __idiv__, __rdiv__
136
137- Removed these attributes from Python modules:
138 * operator module: div, idiv, __div__, __idiv__
139
Neal Norwitz4886cc32006-08-21 17:06:07 +0000140- Removed these C APIs:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000141 PyNumber_Coerce(), PyNumber_CoerceEx()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000142
143- Removed these C slots/fields:
144 nb_divide, nb_inplace_divide
145
146- Removed these macros:
147 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
148
149- Removed these typedefs:
150 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
151 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc
152
153- Removed these opcodes:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000154 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
155
156- zip returns an iterator
157
158- Additions:
Georg Brandl66a796e2006-12-19 20:50:34 +0000159 set literals, ellipsis literal
Neal Norwitz378b2c92006-08-29 07:57:22 +0000160
Neal Norwitz4886cc32006-08-21 17:06:07 +0000161
162Extension Modules
163-----------------
164
Collin Winter390d29c2007-03-21 20:10:51 +0000165- isCallable() and sequenceIncludes() have been removed from the operator
166 module.
167
168
Neal Norwitz4886cc32006-08-21 17:06:07 +0000169Library
170-------
171
Collin Winter670e6922007-03-21 02:57:17 +0000172- Patch #1680961: atexit has been reimplemented in C.
173
Guido van Rossum893523e2007-01-10 01:29:06 +0000174- Removed all traces of the sets module.
175
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000176Build
177-----
178
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000179C API
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181
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000182Tests
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184
Brett Cannonced04e02005-02-13 22:53:22 +0000185Documentation
186-------------
187
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000188Mac
189---
190
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000191New platforms
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193
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000194Tools/Demos
195-----------
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Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000197**(For information about older versions, consult the HISTORY file.)**