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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
19- Unify range() and xrange().
20
Guido van Rossumd8faa362007-04-27 19:54:29 +000021- Use io.py instead of C stdio everywhere.
Neal Norwitz4886cc32006-08-21 17:06:07 +000022
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
Guido van Rossumd8faa362007-04-27 19:54:29 +000031- Merged from (2.6) trunk at r54987.
32
Nick Coghlan650f0d02007-04-15 12:05:43 +000033- Patch #1660500: hide iteration variable in list comps, add set comps
34 and use common code to handle compilation of iterative expressions
35
Guido van Rossume27dc722007-03-27 22:37:34 +000036- By default, != returns the opposite of ==, unless the latter returns
37 NotImplemented.
38
Collin Winter670e6922007-03-21 02:57:17 +000039- Patch #1680961: sys.exitfunc has been removed and replaced with a private
40 C-level API.
41
Georg Brandl801dd732007-03-18 20:18:31 +000042- PEP 3115: new metaclasses: the metaclass is now specified as a
43 keyword arg in the class statement, which can now use the full syntax of
44 a parameter list. Also, the metaclass can implement a __prepare__ function
45 which will be called to create the dictionary for the new class namespace.
46
Georg Brandl428f0642007-03-18 18:35:15 +000047- The long-deprecated argument "pend" of PyFloat_FromString() has been
48 removed.
49
Georg Brandle32b4222007-03-10 22:13:27 +000050- The dir() function has been extended to call the __dir__() method on
51 its argument, if it exists. If not, it will work like before. This allows
52 customizing the output of dir() in the presence of a __getattr__().
Brett Cannonba7bf492007-02-27 00:15:55 +000053
Georg Brandle32b4222007-03-10 22:13:27 +000054- Removed indexing/slicing on BaseException.
Neal Norwitz2633c692007-02-26 22:22:47 +000055
Georg Brandle32b4222007-03-10 22:13:27 +000056- Removed the exceptions module, all the exceptions are already builtin.
57
58- input() became raw_input(): the name input() now implements the
Guido van Rossum0240b922007-02-26 21:23:50 +000059 functionality formerly known as raw_input(); the name raw_input()
60 is no longer defined.
61
Brett Cannon39590462007-02-26 22:01:14 +000062- Classes listed in an 'except' clause must inherit from BaseException.
Brett Cannonf74225d2007-02-26 21:10:16 +000063
Guido van Rossumcc2b0162007-02-11 06:12:03 +000064- PEP 3106: dict.iterkeys(), .iteritems(), .itervalues() are now gone;
65 and .keys(), .items(), .values() return dict views.
66
Guido van Rossum8b545362007-02-09 23:52:14 +000067- PEP 3105: print is now a function. Also (not in the PEP) the
68 'softspace' attribute of files is now gone (since print() doesn't use
69 it). A side effect of this change is that you can get incomplete
70 output lines in interactive sessions:
71
72 >>> print(42, end="")
73 42>>>
74
75 We may be able to fix this after the I/O library rewrite.
Guido van Rossum4502c802007-02-09 05:42:38 +000076
Brett Cannon398db8b2007-01-29 23:44:37 +000077- PEP 3102: keyword-only arguments.
78
Guido van Rossumd4588c12007-02-13 19:55:23 +000079- Int/Long unification is complete. The 'long' built-in type
Guido van Rossumec7027f2007-01-30 00:00:40 +000080 and literals with trailing 'L' or 'l' have been removed.
81 Performance may be sub-optimal (haven't really benchmarked).
Guido van Rossumab186842007-01-14 03:42:30 +000082
83- 'except E, V' must now be spelled as 'except E as V' and deletes V
84 at the end of the except clause; V must be a simple name.
85
Neal Norwitzc1505362006-12-28 06:47:50 +000086- Added function annotations per PEP 3107.
87
Jeremy Hyltona4f9fc62007-02-27 15:53:28 +000088- Added nonlocal declaration from PEP 3104
89
90 >>> def f(x):
91 ... def inc():
92 ... nonlocal x
93 ... x += 1
94 ... return x
95 ... return inc
96 ...
97 >>> inc = f(0)
98 >>> inc()
99 1
100 >>> inc()
101 2
102
Georg Brandl66a796e2006-12-19 20:50:34 +0000103- Moved intern() to sys.intern().
104
105- exec is now a function.
106
107- Renamed nb_nonzero to nb_bool and __nonzero__ to __bool__.
Jack Diederich4dafcc42006-11-28 19:15:13 +0000108
Neal Norwitz4886cc32006-08-21 17:06:07 +0000109- Classic classes are a thing of the past. All classes are new style.
110
111- Exceptions *must* derive from BaseException.
112
113- Integer division always returns a float. The -Q option is no more.
114 All the following are gone:
115 * PyNumber_Divide and PyNumber_InPlaceDivide
116 * __div__, __rdiv__, and __idiv__
117 * nb_divide, nb_inplace_divide
118 * operator.div, operator.idiv, operator.__div__, operator.__idiv__
119 (Only __truediv__ and __floordiv__ remain, not sure how to handle them
120 if we want to re-use __div__ and friends. If we do, it will make
121 it harder to write code for both 2.x and 3.x.)
122
123- 'as' and 'with' are keywords.
124
125- Absolute import is the default behavior for 'import foo' etc.
126
Neal Norwitz378b2c92006-08-29 07:57:22 +0000127- Removed support for syntax:
128 backticks (`x`), <>
129
Neal Norwitz4886cc32006-08-21 17:06:07 +0000130- Removed these Python builtins:
Neal Norwitz81fe3412007-02-26 21:42:55 +0000131 apply(), coerce()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000132
Neal Norwitz378b2c92006-08-29 07:57:22 +0000133- Removed these Python methods:
134 {}.has_key
135
Neal Norwitz4886cc32006-08-21 17:06:07 +0000136- Removed these Python slots:
137 __coerce__, __div__, __idiv__, __rdiv__
138
139- Removed these attributes from Python modules:
140 * operator module: div, idiv, __div__, __idiv__
141
Neal Norwitz4886cc32006-08-21 17:06:07 +0000142- Removed these C APIs:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000143 PyNumber_Coerce(), PyNumber_CoerceEx()
Neal Norwitz4886cc32006-08-21 17:06:07 +0000144
145- Removed these C slots/fields:
146 nb_divide, nb_inplace_divide
147
148- Removed these macros:
149 staticforward, statichere, PyArg_GetInt, PyArg_NoArgs
150
151- Removed these typedefs:
152 intargfunc, intintargfunc, intobjargproc, intintobjargproc,
153 getreadbufferproc, getwritebufferproc, getsegcountproc, getcharbufferproc
154
155- Removed these opcodes:
Neal Norwitz378b2c92006-08-29 07:57:22 +0000156 BINARY_DIVIDE, INPLACE_DIVIDE, UNARY_CONVERT
157
158- zip returns an iterator
159
160- Additions:
Georg Brandl66a796e2006-12-19 20:50:34 +0000161 set literals, ellipsis literal
Neal Norwitz378b2c92006-08-29 07:57:22 +0000162
Neal Norwitz4886cc32006-08-21 17:06:07 +0000163
164Extension Modules
165-----------------
166
Collin Winter390d29c2007-03-21 20:10:51 +0000167- isCallable() and sequenceIncludes() have been removed from the operator
168 module.
169
170
Neal Norwitz4886cc32006-08-21 17:06:07 +0000171Library
172-------
173
Neal Norwitz9d72bb42007-04-17 08:48:32 +0000174- Remove functions in string module that are also string methods.
175
176- Remove obsolete modules: xmllib, stringold.
177
178- Remove support for long obsolete platforms: plat-aix3, plat-irix5.
179
180- Remove xmlrpclib.SlowParser. It was based on xmllib.
181
Collin Winter670e6922007-03-21 02:57:17 +0000182- Patch #1680961: atexit has been reimplemented in C.
183
Guido van Rossum893523e2007-01-10 01:29:06 +0000184- Removed all traces of the sets module.
185
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000186Build
187-----
188
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000189C API
190-----
191
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000192Tests
193-----
194
Brett Cannonced04e02005-02-13 22:53:22 +0000195Documentation
196-------------
197
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000198Mac
199---
200
Hye-Shik Chang4e422812005-07-17 02:36:59 +0000201New platforms
202-------------
203
Raymond Hettinger4901a1f2004-12-02 08:59:14 +0000204Tools/Demos
205-----------
206
Skip Montanaroe5d7f7f2002-09-20 14:16:59 +0000207**(For information about older versions, consult the HISTORY file.)**
Neal Norwitz6cb726a2007-05-07 06:59:22 +0000208