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author | Georg Brandl <georg@python.org> | 2010-03-14 10:56:14 (GMT) |
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committer | Georg Brandl <georg@python.org> | 2010-03-14 10:56:14 (GMT) |
commit | 93dc9eb2a39ccc84d50012f8133f05e81183e8a6 (patch) | |
tree | 6f4fd2b8f7c457f56508450b8ba735e7169ebae1 /Doc | |
parent | c0e22b7889a4b8b5002a1ac4ae25273e6d30ea6f (diff) | |
download | cpython-93dc9eb2a39ccc84d50012f8133f05e81183e8a6.zip cpython-93dc9eb2a39ccc84d50012f8133f05e81183e8a6.tar.gz cpython-93dc9eb2a39ccc84d50012f8133f05e81183e8a6.tar.bz2 |
Merged revisions 78760,78771-78773,78802,78922,78952 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r78760 | georg.brandl | 2010-03-07 16:23:59 +0100 (So, 07 Mär 2010) | 1 line
#5341: more built-in vs builtin fixes.
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r78771 | georg.brandl | 2010-03-07 21:58:31 +0100 (So, 07 Mär 2010) | 1 line
#8085: The function is called PyObject_NewVar, not PyObject_VarNew.
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r78772 | georg.brandl | 2010-03-07 22:12:28 +0100 (So, 07 Mär 2010) | 1 line
#8039: document conditional expressions better, giving them their own section.
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r78773 | georg.brandl | 2010-03-07 22:32:06 +0100 (So, 07 Mär 2010) | 1 line
#8044: document Py_{Enter,Leave}RecursiveCall functions.
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r78802 | georg.brandl | 2010-03-08 17:28:40 +0100 (Mo, 08 Mär 2010) | 1 line
Fix typo.
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r78922 | georg.brandl | 2010-03-13 14:41:58 +0100 (Sa, 13 Mär 2010) | 1 line
Update for new download location.
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r78952 | georg.brandl | 2010-03-14 10:55:08 +0100 (So, 14 Mär 2010) | 1 line
#8137: add iso-8859-16 to the standard encodings table.
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Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/c-api/exceptions.rst | 30 | ||||
-rw-r--r-- | Doc/c-api/gcsupport.rst | 2 | ||||
-rw-r--r-- | Doc/c-api/typeobj.rst | 2 | ||||
-rw-r--r-- | Doc/library/argparse.rst | 2 | ||||
-rw-r--r-- | Doc/library/codecs.rst | 6 | ||||
-rw-r--r-- | Doc/reference/executionmodel.rst | 4 | ||||
-rw-r--r-- | Doc/reference/expressions.rst | 35 | ||||
-rw-r--r-- | Doc/whatsnew/2.6.rst | 24 |
8 files changed, 77 insertions, 28 deletions
diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst index 5fa35a0..619f0f6 100644 --- a/Doc/c-api/exceptions.rst +++ b/Doc/c-api/exceptions.rst @@ -471,6 +471,36 @@ Exception Objects This steals a reference to *ctx*. +Recursion Control +================= + +These two functions provide a way to perform safe recursive calls at the C +level, both in the core and in extension modules. They are needed if the +recursive code does not necessarily invoke Python code (which tracks its +recursion depth automatically). + +.. cfunction:: int Py_EnterRecursiveCall(char *where) + + Marks a point where a recursive C-level call is about to be performed. + + If :const:`USE_STACKCHECK` is defined, this function checks if the the OS + stack overflowed using :cfunc:`PyOS_CheckStack`. In this is the case, it + sets a :exc:`MemoryError` and returns a nonzero value. + + The function then checks if the recursion limit is reached. If this is the + case, a :exc:`RuntimeError` is set and a nonzero value is returned. + Otherwise, zero is returned. + + *where* should be a string such as ``" in instance check"`` to be + concatenated to the :exc:`RuntimeError` message caused by the recursion depth + limit. + +.. cfunction:: void Py_LeaveRecursiveCall() + + Ends a :cfunc:`Py_EnterRecursiveCall`. Must be called once for each + *successful* invocation of :cfunc:`Py_EnterRecursiveCall`. + + .. _standardexceptions: Standard Exceptions diff --git a/Doc/c-api/gcsupport.rst b/Doc/c-api/gcsupport.rst index 4f4d27d..1a280c8 100644 --- a/Doc/c-api/gcsupport.rst +++ b/Doc/c-api/gcsupport.rst @@ -28,7 +28,7 @@ include the :const:`Py_TPFLAGS_HAVE_GC` and provide an implementation of the Constructors for container types must conform to two rules: #. The memory for the object must be allocated using :cfunc:`PyObject_GC_New` - or :cfunc:`PyObject_GC_VarNew`. + or :cfunc:`PyObject_GC_NewVar`. #. Once all the fields which may contain references to other containers are initialized, it must call :cfunc:`PyObject_GC_Track`. diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst index 378bfe1..eb8a83e 100644 --- a/Doc/c-api/typeobj.rst +++ b/Doc/c-api/typeobj.rst @@ -182,7 +182,7 @@ type objects) *must* have the :attr:`ob_size` field. instance; this is normally :cfunc:`PyObject_Del` if the instance was allocated using :cfunc:`PyObject_New` or :cfunc:`PyObject_VarNew`, or :cfunc:`PyObject_GC_Del` if the instance was allocated using - :cfunc:`PyObject_GC_New` or :cfunc:`PyObject_GC_VarNew`. + :cfunc:`PyObject_GC_New` or :cfunc:`PyObject_GC_NewVar`. This field is inherited by subtypes. diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst index edb28e8..92ac6c4 100644 --- a/Doc/library/argparse.rst +++ b/Doc/library/argparse.rst @@ -855,7 +855,7 @@ By default, ArgumentParser objects read command-line args in as simple strings. However, quite often the command-line string should instead be interpreted as another type, like a :class:`float`, :class:`int` or :class:`file`. The ``type`` keyword argument of :meth:`add_argument` allows any necessary -type-checking and type-conversions to be performed. Many common builtin types +type-checking and type-conversions to be performed. Many common built-in types can be used directly as the value of the ``type`` argument:: >>> parser = argparse.ArgumentParser() diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst index 785f3f6..13e86a2 100644 --- a/Doc/library/codecs.rst +++ b/Doc/library/codecs.rst @@ -1065,11 +1065,13 @@ particular, the following variants typically exist: +-----------------+--------------------------------+--------------------------------+ | iso8859_10 | iso-8859-10, latin6, L6 | Nordic languages | +-----------------+--------------------------------+--------------------------------+ -| iso8859_13 | iso-8859-13 | Baltic languages | +| iso8859_13 | iso-8859-13, latin7, L7 | Baltic languages | +-----------------+--------------------------------+--------------------------------+ | iso8859_14 | iso-8859-14, latin8, L8 | Celtic languages | +-----------------+--------------------------------+--------------------------------+ -| iso8859_15 | iso-8859-15 | Western Europe | +| iso8859_15 | iso-8859-15, latin9, L9 | Western Europe | ++-----------------+--------------------------------+--------------------------------+ +| iso8859_16 | iso-8859-16, latin10, L10 | South-Eastern Europe | +-----------------+--------------------------------+--------------------------------+ | johab | cp1361, ms1361 | Korean | +-----------------+--------------------------------+--------------------------------+ diff --git a/Doc/reference/executionmodel.rst b/Doc/reference/executionmodel.rst index 90791d2..b4c29b1 100644 --- a/Doc/reference/executionmodel.rst +++ b/Doc/reference/executionmodel.rst @@ -120,7 +120,7 @@ namespace is searched. The global statement must precede all uses of the name. .. index:: pair: restricted; execution -The built-in namespace associated with the execution of a code block is actually +The builtins namespace associated with the execution of a code block is actually found by looking up the name ``__builtins__`` in its global namespace; this should be a dictionary or a module (in the latter case the module's dictionary is used). By default, when in the :mod:`__main__` module, ``__builtins__`` is @@ -132,7 +132,7 @@ weak form of restricted execution. .. impl-detail:: Users should not touch ``__builtins__``; it is strictly an implementation - detail. Users wanting to override values in the built-in namespace should + detail. Users wanting to override values in the builtins namespace should :keyword:`import` the :mod:`builtins` module and modify its attributes appropriately. diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index d074ebb..d0acd20 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -1113,12 +1113,7 @@ Boolean operations pair: Conditional; expression pair: Boolean; operation -Boolean operations have the lowest priority of all Python operations: - .. productionlist:: - expression: `conditional_expression` | `lambda_form` - expression_nocond: `or_test` | `lambda_form_nocond` - conditional_expression: `or_test` ["if" `or_test` "else" `expression`] or_test: `and_test` | `or_test` "or" `and_test` and_test: `not_test` | `and_test` "and" `not_test` not_test: `comparison` | "not" `not_test` @@ -1135,10 +1130,6 @@ truth value by providing a :meth:`__bool__` method. The operator :keyword:`not` yields ``True`` if its argument is false, ``False`` otherwise. -The expression ``x if C else y`` first evaluates *C* (*not* *x*); if *C* is -true, *x* is evaluated and its value is returned; otherwise, *y* is evaluated -and its value is returned. - .. index:: operator: and The expression ``x and y`` first evaluates *x*; if *x* is false, its value is @@ -1158,6 +1149,30 @@ not bother to return a value of the same type as its argument, so e.g., ``not 'foo'`` yields ``False``, not ``''``.) +Conditional Expressions +======================= + +.. versionadded:: 2.5 + +.. index:: + pair: conditional; expression + pair: ternary; operator + +.. productionlist:: + conditional_expression: `or_test` ["if" `or_test` "else" `expression`] + expression: `conditional_expression` | `lambda_form` + expression_nocond: `or_test` | `lambda_form_nocond` + +Conditional expressions (sometimes called a "ternary operator") have the lowest +priority of all Python operations. + +The expression ``x if C else y`` first evaluates the condition, *C* (*not* *x*); +if *C* is true, *x* is evaluated and its value is returned; otherwise, *y* is +evaluated and its value is returned. + +See :pep:`308` for more details about conditional expressions. + + .. _lambdas: .. _lambda: @@ -1252,6 +1267,8 @@ groups from right to left). +===============================================+=====================================+ | :keyword:`lambda` | Lambda expression | +-----------------------------------------------+-------------------------------------+ +| :keyword:`if` -- :keyword:`else` | Conditional expression | ++-----------------------------------------------+-------------------------------------+ | :keyword:`or` | Boolean OR | +-----------------------------------------------+-------------------------------------+ | :keyword:`and` | Boolean AND | diff --git a/Doc/whatsnew/2.6.rst b/Doc/whatsnew/2.6.rst index 1952032..c94327b 100644 --- a/Doc/whatsnew/2.6.rst +++ b/Doc/whatsnew/2.6.rst @@ -111,9 +111,9 @@ are: :func:`reduce` function. Python 3.0 adds several new built-in functions and changes the -semantics of some existing built-ins. Functions that are new in 3.0 +semantics of some existing builtins. Functions that are new in 3.0 such as :func:`bin` have simply been added to Python 2.6, but existing -built-ins haven't been changed; instead, the :mod:`future_builtins` +builtins haven't been changed; instead, the :mod:`future_builtins` module has versions with the new 3.0 semantics. Code written to be compatible with 3.0 can do ``from future_builtins import hex, map`` as necessary. @@ -837,7 +837,7 @@ formatted. It receives a single argument, the format specifier:: else: return str(self) -There's also a :func:`format` built-in that will format a single +There's also a :func:`format` builtin that will format a single value. It calls the type's :meth:`__format__` method with the provided specifier:: @@ -1168,7 +1168,7 @@ access protocol. Abstract Base Classes (or ABCs) are an equivalent feature for Python. The ABC support consists of an :mod:`abc` module containing a metaclass called :class:`ABCMeta`, special handling of this metaclass by the :func:`isinstance` and :func:`issubclass` -built-ins, and a collection of basic ABCs that the Python developers +builtins, and a collection of basic ABCs that the Python developers think will be widely useful. Future versions of Python will probably add more ABCs. @@ -1322,9 +1322,9 @@ an octal number, but it does add support for "0o" and "0b":: >>> 0b101111 47 -The :func:`oct` built-in still returns numbers +The :func:`oct` builtin still returns numbers prefixed with a leading zero, and a new :func:`bin` -built-in returns the binary representation for a number:: +builtin returns the binary representation for a number:: >>> oct(42) '052' @@ -1333,7 +1333,7 @@ built-in returns the binary representation for a number:: >>> bin(173) '0b10101101' -The :func:`int` and :func:`long` built-ins will now accept the "0o" +The :func:`int` and :func:`long` builtins will now accept the "0o" and "0b" prefixes when base-8 or base-2 are requested, or when the *base* argument is zero (signalling that the base used should be determined from the string):: @@ -1419,7 +1419,7 @@ can be shifted left and right with ``<<`` and ``>>``, combined using bitwise operations such as ``&`` and ``|``, and can be used as array indexes and slice boundaries. -In Python 3.0, the PEP slightly redefines the existing built-ins +In Python 3.0, the PEP slightly redefines the existing builtins :func:`round`, :func:`math.floor`, :func:`math.ceil`, and adds a new one, :func:`math.trunc`, that's been backported to Python 2.6. :func:`math.trunc` rounds toward zero, returning the closest @@ -1527,7 +1527,7 @@ Some smaller changes made to the core Python language are: Previously this would have been a syntax error. (Contributed by Amaury Forgeot d'Arc; :issue:`3473`.) -* A new built-in, ``next(iterator, [default])`` returns the next item +* A new builtin, ``next(iterator, [default])`` returns the next item from the specified iterator. If the *default* argument is supplied, it will be returned if *iterator* has been exhausted; otherwise, the :exc:`StopIteration` exception will be raised. (Backported @@ -1956,9 +1956,9 @@ changes, or look through the Subversion logs for all the details. (Contributed by Phil Schwartz; :issue:`1221598`.) * The :func:`reduce` built-in function is also available in the - :mod:`functools` module. In Python 3.0, the built-in has been + :mod:`functools` module. In Python 3.0, the builtin has been dropped and :func:`reduce` is only available from :mod:`functools`; - currently there are no plans to drop the built-in in the 2.x series. + currently there are no plans to drop the builtin in the 2.x series. (Patched by Christian Heimes; :issue:`1739906`.) * When possible, the :mod:`getpass` module will now use @@ -2760,7 +2760,7 @@ The functions in this module currently include: * ``filter(predicate, iterable)``, ``map(func, iterable1, ...)``: the 3.0 versions - return iterators, unlike the 2.x built-ins which return lists. + return iterators, unlike the 2.x builtins which return lists. * ``hex(value)``, ``oct(value)``: instead of calling the :meth:`__hex__` or :meth:`__oct__` methods, these versions will |