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Author SHA1 Message Date
Peter Dimov
8c014d2fde Save state before 1.36 merges.
[SVN r47337]
2008-07-12 09:06:42 +00:00
Dave Abrahams
c44100afda Make valid HTML
[SVN r46844]
2008-06-29 12:26:17 +00:00
Joel de Guzman
1dee81dc71 added note on removing targets
[SVN r46817]
2008-06-28 18:24:17 +00:00
Beman Dawes
801326275f With his kind permission, change Jaakko "Järvi" to "Jarvi"
[SVN r46808]
2008-06-28 13:45:21 +00:00
Dave Abrahams
98f20f30d6 Compatibility with Apache STDCXX library. Don't assume eh.h comes along with the other headers automatically.
[SVN r46721]
2008-06-26 16:41:34 +00:00
Markus Schöpflin
b01e0e6b9c Added missing ostream header file.
[SVN r46115]
2008-06-04 15:11:05 +00:00
Ralf W. Grosse-Kunstleve
b0a9b11c9c Projects using Boost.Python: PolyBoRi (text provided by Michael Brickenstein)
[SVN r45920]
2008-05-29 20:04:19 +00:00
Ralf W. Grosse-Kunstleve
304277b806 See Python C++-SIG thread: "object.attr(object& attrname) proposal"
Started 2008-05-25 by hohehohe2@gmail.com.

Excerpts:

If char const* is passed to objecjt.attr(), it uses
PyObject_GetAttrStrng() or PyObject_SetAttrStrng().  If object is
passed to objecjt.attr(), it takes the object as a Python string
object and uses PyObject_GetAttr() or PyObject_SetAttr().

If attr() behaves like this, it can be useful when there are lots
of objects which you know have the same attribute name. You can save
time by first making a boost::python::object and passing it to every
object's attr() inside a loop.

I just made a bit of modification to boost:python locally and did a
quick test, like

test 1:
  for(int i = 0; i < n; ++i)
  {
    omain.attr(attrname) = 444; //attrname is a char const*
  }

test 2:
  for(int i = 0; i < n; ++i)
  {
    object o = omain.attr(attrname); //attrname is a char const*
  }

test 3:
  for(int i = 0; i < n; ++i)
  {
    omain.attr(oaaaa) = 444; //oaaaa is boost::python::object that represents a string
  }

test 4:
  for(int i = 0; i < n; ++i)
  {
    object o = omain.attr(oaaaa); //oaaaa is boost::python::object that represents a string
  }

and it reasonably reflected the difference between PyObject_*Attr() and PyObject_*AttrString.

test 1 :2783ms
test 2 :2357ms
test 3 :1882ms
test 4 :1267ms

test5: PyObject_SetAttrString(po_main, "aaaa", po_num444);
test6: Py_DECREF(PyObject_GetAttrString(po_main, "aaaa"));
test7: PyObject_SetAttr(po_main, po_aaaa, po_num444);
test8: Py_DECREF(PyObject_GetAttr(po_main, po_aaaa));
(po_ prefixed variables are PyObject*),

all inside each for loop, and the results were

test 5 :2410ms
test 6 :2277ms
test 7 :1629ms
test 8 :1094ms

It's boost 1.35.0, Python 2.5 on linux(gcc4.1.2).
I also did the same test on windows(vs8) and the tendency was not
so different.


[SVN r45918]
2008-05-29 19:48:55 +00:00
Ralf W. Grosse-Kunstleve
a334649b0c braces added to resolve g++ 4.3.0 warning
[SVN r45359]
2008-05-14 19:38:08 +00:00
Daniel James
79b7f88df6 Quote href values - our tools don't support unquoted values.
[SVN r45283]
2008-05-11 13:49:20 +00:00
Daniel James
a33ed032c6 Merge in documentation fixes. Apart from the change to optional's documenation
Jamfile, which I included by mistake.

Fixes #1659, #1661, #1684, #1685, 1687, #1690, #1801

I wrote about this at:

http://lists.boost.org/Archives/boost/2008/04/136405.php

Merged revisions 44585-44806 via svnmerge from 
https://svn.boost.org/svn/boost/branches/doc

........
  r44585 | danieljames | 2008-04-19 16:25:27 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix broken link to vacpp in bjam docs. Refs #1512
........
  r44586 | danieljames | 2008-04-19 16:27:36 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix broken link to bcpp in bjam docs. Refs #1513
........
  r44587 | danieljames | 2008-04-19 16:33:58 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  DateTime documentation - Fix a link to the serialization library. Refs #1659
........
  r44588 | danieljames | 2008-04-19 16:35:36 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in interprocess & intrusive. Refs #1661
........
  r44589 | danieljames | 2008-04-19 16:37:39 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in the python docs. Refs #1684.
........
  r44590 | danieljames | 2008-04-19 16:38:29 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Work around a quickbook bug which is affecting the python docs. Refs #1684.
........
  r44591 | danieljames | 2008-04-19 16:39:34 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix a broken link in the numeric conversion docs. Refs #1685
........
  r44592 | danieljames | 2008-04-19 16:40:45 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix some links in the optional docs. Refs #1687
........
  r44593 | danieljames | 2008-04-19 16:42:09 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix link to the hash documentation from bimap. Refs #1690
........
  r44599 | danieljames | 2008-04-19 18:07:33 +0100 (Sat, 19 Apr 2008) | 2 lines
  
  Fix a typo in the format library. Refs #1801
........
  r44600 | danieljames | 2008-04-19 19:20:59 +0100 (Sat, 19 Apr 2008) | 1 line
  
  Initialise svnmerge.
........
  r44641 | danieljames | 2008-04-20 18:59:47 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix the lincense url in shared container iterator documentation.
........
  r44642 | danieljames | 2008-04-20 19:00:00 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix image link in the mpi documentation.
........
  r44643 | danieljames | 2008-04-20 19:00:11 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix a typo in the spirit docs.
........
  r44644 | danieljames | 2008-04-20 19:00:23 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Escape the slash so that quickbook doesn't think it the start of an italic section, and mess up the link. Refs #1844
........
  r44647 | danieljames | 2008-04-20 19:39:47 +0100 (Sun, 20 Apr 2008) | 2 lines
  
  Fix another typo in spirit docs.
........


[SVN r44807]
2008-04-27 07:39:49 +00:00
18 changed files with 517 additions and 253 deletions

View File

@@ -158,8 +158,8 @@ all the parts of your Python installation. If it isn't, consider
<p>If you're still having trouble, Someone on one of the following
mailing lists may be able to help:</p>
<ul class="simple">
<li>The <a class="reference external" href="http://www.boost.org/community/groups.html#jamboost">Boost.Build mailing list</a> for issues related to Boost.Build</li>
<li>The Python <a class="reference external" href="http://www.boost.org/community/groups.html#cplussig">C++ Sig</a> for issues specifically related to Boost.Python</li>
<li>The <a class="reference external" href="http://www.boost.org/more/mailing_lists.htm#jamboost">Boost.Build mailing list</a> for issues related to Boost.Build</li>
<li>The Python <a class="reference external" href="http://www.boost.org/more/mailing_lists.htm#cplussig">C++ Sig</a> for issues specifically related to Boost.Python</li>
</ul>
</div>
<div class="section" id="in-case-everything-seemed-to-work">

View File

@@ -177,8 +177,8 @@ mailing lists may be able to help:
* The `Boost.Build mailing list`__ for issues related to Boost.Build
* The Python `C++ Sig`__ for issues specifically related to Boost.Python
__ http://www.boost.org/community/groups.html#jamboost
__ http://www.boost.org/community/groups.html#cplussig
__ http://www.boost.org/more/mailing_lists.htm#jamboost
__ http://www.boost.org/more/mailing_lists.htm#cplussig
In Case Everything Seemed to Work
---------------------------------

View File

@@ -375,6 +375,27 @@
application modules, including GUI and post-processing of results.</p>
</dd>
<dt><b><a href="http://polybori.sourceforge.net/">PolyBoRi</a></b></dt>
<dd>
<p><a href="mailto:brickenstein@mfo.de"
>Michael Brickenstein</a> writes:</p>
<blockquote>
<p>The core of PolyBoRi is a C++ library, which provides
high-level data types for Boolean polynomials and monomials,
exponent vectors, as well as for the underlying polynomial
rings and subsets of the powerset of the Boolean variables. As
a unique approach, binary decision diagrams are used as
internal storage type for polynomial structures. On top of
this C++-library we provide a Python interface. This allows
parsing of complex polynomial systems, as well as sophisticated
and extendable strategies for Gr&ouml;bner basis computation.
Boost.Python has helped us to create this interface in a
very clean way.</p>
</blockquote>
</dd>
<dt><b><a href="http://www.rationaldiscovery.com">Rational Discovery
LLC</a></b></dt>
@@ -435,11 +456,11 @@
</dl>
<hr>
<p>Revised
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
15 July, 2003</p>
29 May, 2008</p>
<p><i>&copy; Copyright <a href="http://www.boost.org/people/dave_abrahams.htm">Dave
Abrahams</a> 2002-2003.</i></p>
Abrahams</a> 2002-2008.</i></p>
</body>
</html>

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@@ -47,7 +47,7 @@
&nbsp;</dt>
<dt><b><a href=
"http://www.boost.org/community/groups.html#cplussig">The Python
"http://www.boost.org/more/mailing_lists.htm#cplussig">The Python
C++-sig</a></b> mailing list is a forum for discussing Python/C++
interoperability, and Boost.Python in particular. Post your
Boost.Python questions here.<br>

View File

@@ -93,7 +93,7 @@ who had to use a different tool.
We will skip over the details. Our objective will be to simply create
the hello world module and run it in Python. For a complete reference to
building Boost.Python, check out: [@/libs/python/doc/building.html
building Boost.Python, check out: [@../../../building.html
building.html]. After this brief ['bjam] tutorial, we should have built
the DLLs and run a python program using the extension.
@@ -118,7 +118,7 @@ platforms. The complete list of Bjam executables can be found
[h2 Let's Jam!]
__jam__
[@/libs/python/example/tutorial/Jamroot Here] is our minimalist Jamroot
[@../../../../example/tutorial/Jamroot Here] is our minimalist Jamroot
file. Simply copy the file and tweak [^use-project boost] to where your
boost root directory is and your OK.
@@ -186,6 +186,10 @@ And so on... Finally:
Or something similar. If all is well, you should now have built the DLLs and
run the Python program.
[note Starting from Boost 1.35, bjam erases the generated executables
(e.g. pyd file) after the test has concluded to conserve disk space.
To keep bjam from doing that, pass --preserve-test-targets to bjam.]
[:[*There you go... Have fun!]]
[endsect]
@@ -463,7 +467,7 @@ functions so that a Python override may be called:
};
Notice too that in addition to inheriting from `Base`, we also multiply-
inherited `wrapper<Base>` (See [@/libs/python/doc/v2/wrapper.html Wrapper]). The
inherited `wrapper<Base>` (See [@../../../v2/wrapper.html Wrapper]). The
`wrapper` template makes the job of wrapping classes that are meant to
overridden in Python, easier.
@@ -495,7 +499,7 @@ Methods correspond roughly to C++'s [*member functions]]
[section Virtual Functions with Default Implementations]
We've seen in the previous section how classes with pure virtual functions are
wrapped using Boost.Python's [@/libs/python/doc/v2/wrapper.html class wrapper]
wrapped using Boost.Python's [@../../../v2/wrapper.html class wrapper]
facilities. If we wish to wrap [*non]-pure-virtual functions instead, the
mechanism is a bit different.
@@ -812,7 +816,7 @@ or more policies can be composed by chaining. Here's the general syntax:
policy3<args...> > >
Here is the list of predefined call policies. A complete reference detailing
these can be found [@/libs/python/doc/v2/reference.html#models_of_call_policies here].
these can be found [@../../../v2/reference.html#models_of_call_policies here].
* [*with_custodian_and_ward]: Ties lifetimes of the arguments
* [*with_custodian_and_ward_postcall]: Ties lifetimes of the arguments and results
@@ -970,7 +974,7 @@ fourth macro argument). The thin wrappers are all enclosed in a class named
.def("wack_em", &george::wack_em, george_overloads());
See the [@/libs/python/doc/v2/overloads.html#BOOST_PYTHON_FUNCTION_OVERLOADS-spec overloads reference]
See the [@../../../v2/overloads.html#BOOST_PYTHON_FUNCTION_OVERLOADS-spec overloads reference]
for details.
[h2 init and optional]
@@ -1267,7 +1271,7 @@ associated with the C++ type passed as its first parameter.
The scope is a class that has an associated global Python object which
controls the Python namespace in which new extension classes and wrapped
functions will be defined as attributes. Details can be found
[@/libs/python/doc/v2/scope.html here].]
[@../../../v2/scope.html here].]
You can access those values in Python as
@@ -1328,7 +1332,7 @@ in Boost's [^/libs/python/build/bin-stage] subdirectory. On Windows, the
variants are called [^boost_python.lib] (for release builds) and
[^boost_python_debug.lib] (for debugging). If you can't find the libraries,
you probably haven't built Boost.Python yet. See
[@/libs/python/doc/building.html Building and Testing] on how to do this.
[@../../../building.html Building and Testing] on how to do this.
Python's library can be found in the [^/libs] subdirectory of
your Python directory. On Windows it is called pythonXY.lib where X.Y is
@@ -1386,8 +1390,8 @@ There is a difference however. While the reference-counting is fully
automatic in Python, the Python\/C API requires you to do it
[@http://www.python.org/doc/current/api/refcounts.html by hand]. This is
messy and especially hard to get right in the presence of C++ exceptions.
Fortunately Boost.Python provides the [@/libs/python/doc/v2/handle.html handle] and
[@/libs/python/doc/v2/object.html object] class templates to automate the process.
Fortunately Boost.Python provides the [@../../../v2/handle.html handle] and
[@../../../v2/object.html object] class templates to automate the process.
[h2 Running Python code]
@@ -1450,7 +1454,7 @@ which returns the result directly:
[h2 Exception handling]
If an exception occurs in the evaluation of the python expression,
[@/libs/python/doc/v2/errors.html#error_already_set-spec error_already_set] is thrown:
[@../../../v2/errors.html#error_already_set-spec error_already_set] is thrown:
try
{
@@ -1954,13 +1958,13 @@ This method is recommended too if you are developing the C++ library and
exporting it to Python at the same time: changes in a class will only demand
the compilation of a single cpp, instead of the entire wrapper code.
[note If you're exporting your classes with [@/libs/python/doc/pyste/index.html Pyste],
[note If you're exporting your classes with [@../../../../pyste/index.html Pyste],
take a look at the [^--multiple] option, that generates the wrappers in
various files as demonstrated here.]
[note This method is useful too if you are getting the error message
['"fatal error C1204:Compiler limit:internal structure overflow"] when compiling
a large source file, as explained in the [@/libs/python/doc/v2/faq.html#c1204 FAQ].]
a large source file, as explained in the [@../../../v2/faq.html#c1204 FAQ].]
[endsect]
[endsect] [/ General Techniques]

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@@ -4,7 +4,7 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
<link rel="stylesheet" type="text/css" href="../../../../boost.css">
<title>Boost.Python - Dereferenceable Concept</title>
</head>
<body link="#0000ff" vlink="#800080">

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@@ -4,7 +4,7 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
<link rel="stylesheet" type="text/css" href="../../../../boost.css">
<title>Boost.Python - Extractor Concept</title>
</head>
<body link="#0000ff" vlink="#800080">

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@@ -4,7 +4,7 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" type="text/css" href=../../../../boost.css>
<link rel="stylesheet" type="text/css" href="../../../../boost.css">
<title>Boost.Python - Holder Concept</title>
</head>
<body link="#0000ff" vlink="#800080">

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@@ -74,6 +74,32 @@
</dl>
</dd>
<dt><a href="#const_objattribute_policies-spec">Class
<code>const_objattribute_policies</code></a></dt>
<dd>
<dl class="page-index">
<dt><a href="#const_objattribute_policies-spec-synopsis">Class
<code>const_objattribute_policies</code> synopsis</a></dt>
<dt><a href="#const_objattribute_policies-spec-statics">Class
<code>const_objattribute_policies</code> static functions</a></dt>
</dl>
</dd>
<dt><a href="#objattribute_policies-spec">Class
<code>objattribute_policies</code></a></dt>
<dd>
<dl class="page-index">
<dt><a href="#objattribute_policies-spec-synopsis">Class
<code>objattribute_policies</code> synopsis</a></dt>
<dt><a href="#objattribute_policies-spec-statics">Class
<code>objattribute_policies</code> static functions</a></dt>
</dl>
</dd>
<dt><a href="#const_item_policies-spec">Class
<code>const_item_policies</code></a></dt>
@@ -328,6 +354,102 @@ static void del(object const&amp;target, char const* key);
<!-- end -->
<!-- begin -->
<h3><a name="const_objattribute_policies-spec"></a>Class
<code>const_objattribute_policies</code></h3>
<p>The policies which are used for proxies representing an attribute
access to a <code>const&nbsp;object</code> when the attribute name is
given as a <code>const&nbsp;object</code>.</p>
<h4><a name="const_objattribute_policies-spec-synopsis"></a>Class
<code>const_objattribute_policies</code> synopsis</h4>
<pre>
namespace boost { namespace python { namespace api
{
struct const_objattribute_policies
{
typedef object const& key_type;
static object get(object const&amp; target, object const& key);
};
}}}
</pre>
<h4><a name="const_objattribute_policies-spec-statics"></a>Class
<code>const_objattribute_policies</code> static functions</h4>
<pre>
static object get(object const&amp; target, object const& key);
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> <code>key</code> is an <code>object</code>
holding a string.</dt>
<dt><b>Effects:</b> accesses the attribute of <code>target</code> named
by <code>key</code>.</dt>
<dt><b>Returns:</b> An <code>object</code> managing the result of the
attribute access.</dt>
<dt><b>Throws:</b> <code><a href=
"errors.html#error_already_set-spec">error_already_set</a></code> if a
Python exception is raised.</dt>
</dl>
<h3><a name="objattribute_policies-spec"></a>Class
<code>objattribute_policies</code></h3>
<p>The policies which are used for proxies representing an attribute
access to a mutable <code>object</code> when the attribute name is
given as a <code>const&nbsp;object</code>.</p>
<h4><a name="objattribute_policies-spec-synopsis"></a>Class
<code>objattribute_policies</code> synopsis</h4>
<pre>
namespace boost { namespace python { namespace api
{
struct objattribute_policies : const_objattribute_policies
{
static object const&amp; set(object const&amp; target, object const& key, object const&amp; value);
static void del(object const&amp;target, object const& key);
};
}}}
</pre>
<h4><a name="objattribute_policies-spec-statics"></a>Class
<code>objattribute_policies</code> static functions</h4>
<pre>
static object const&amp; set(object const&amp; target, object const& key, object const&amp; value);
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> <code>key</code> is an <code>object</code>
holding a string.</dt>
<dt><b>Effects:</b> sets the attribute of <code>target</code> named by
<code>key</code> to <code>value</code>.</dt>
<dt><b>Throws:</b> <code><a href=
"errors.html#error_already_set-spec">error_already_set</a></code> if a
Python exception is raised.</dt>
</dl>
<pre>
static void del(object const&amp;target, object const& key);
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> <code>key</code> is an <code>object</code>
holding a string.</dt>
<dt><b>Effects:</b> deletes the attribute of <code>target</code> named
by <code>key</code>.</dt>
<dt><b>Throws:</b> <code><a href=
"errors.html#error_already_set-spec">error_already_set</a></code> if a
Python exception is raised.</dt>
</dl>
<!-- end -->
<!-- begin -->
<h3><a name="const_item_policies-spec"></a>Class
<code>const_item_policies</code></h3>
@@ -542,6 +664,8 @@ namespace boost { namespace python { namespace api
//
proxy&lt;const_object_attribute&gt; attr(char const*) const;
proxy&lt;object_attribute&gt; attr(char const*);
proxy&lt;const_object_objattribute&gt; attr(object const&) const;
proxy&lt;object_objattribute&gt; attr(object const&);
// item access
//
@@ -608,6 +732,21 @@ proxy&lt;object_attribute&gt; attr(char const* name);
<code>name</code> as its key.</dt>
</dl>
<pre>
proxy&lt;const_object_objattribute&gt; attr(const object& name) const;
proxy&lt;object_objattribute&gt; attr(const object& name);
</pre>
<dl class="function-semantics">
<dt><b>Requires:</b> name is a <code>object</code> holding a string.</dt>
<dt><b>Effects:</b> accesses the named attribute of
<code>*this</code>.</dt>
<dt><b>Returns:</b> a proxy object which binds
<code>object(*static_cast&lt;U*&gt;(this))</code> as its target, and
<code>name</code> as its key.</dt>
</dl>
<pre>
template &lt;class T&gt;
proxy&lt;const_object_item&gt; operator[](T const&amp; key) const;
template &lt;class T&gt;
@@ -938,11 +1077,11 @@ object sum_items(object seq)
</pre>
<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
13 January, 2006
27 May, 2008
<!--webbot bot="Timestamp" endspan i-checksum="39359" -->
</p>
<p><i>&copy; Copyright <a href=
"http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a> 2006.</i></p>
"http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a> 2008.</i></p>
</body>
</html>

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@@ -1,112 +1,93 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0//EN"
"http://www.w3.org/TR/REC-html40/strict.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<title>Boost.Python Pickle Support</title>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Boost.Python Pickle Support</title>
</head>
<div>
<body>
<div>
<img src="../../../../boost.png" alt="boost.png (6897 bytes)" align=
"center" width="277" height="86" />
<hr />
<img src="../../../../boost.png"
alt="boost.png (6897 bytes)"
align="center"
width="277" height="86">
<h1>Boost.Python Pickle Support</h1>Pickle is a Python module for object
serialization, also known as persistence, marshalling, or flattening.
<hr>
<h1>Boost.Python Pickle Support</h1>
<p>It is often necessary to save and restore the contents of an object to
a file. One approach to this problem is to write a pair of functions that
read and write data from a file in a special format. A powerful
alternative approach is to use Python's pickle module. Exploiting
Python's ability for introspection, the pickle module recursively
converts nearly arbitrary Python objects into a stream of bytes that can
be written to a file.</p>
Pickle is a Python module for object serialization, also known
as persistence, marshalling, or flattening.
<p>The Boost Python Library supports the pickle module through the
interface as described in detail in the <a href=
"http://www.python.org/doc/current/lib/module-pickle.html">Python Library
Reference for pickle.</a> This interface involves the special methods
<tt>__getinitargs__</tt>, <tt>__getstate__</tt> and <tt>__setstate__</tt>
as described in the following. Note that Boost.Python is also fully
compatible with Python's cPickle module.</p>
<hr />
<p>
It is often necessary to save and restore the contents of an object to
a file. One approach to this problem is to write a pair of functions
that read and write data from a file in a special format. A powerful
alternative approach is to use Python's pickle module. Exploiting
Python's ability for introspection, the pickle module recursively
converts nearly arbitrary Python objects into a stream of bytes that
can be written to a file.
<h2>The Boost.Python Pickle Interface</h2>At the user level, the
Boost.Python pickle interface involves three special methods:
<p>
The Boost Python Library supports the pickle module
through the interface as described in detail in the
<a href="http://www.python.org/doc/current/lib/module-pickle.html"
>Python Library Reference for pickle.</a> This interface
involves the special methods <tt>__getinitargs__</tt>,
<tt>__getstate__</tt> and <tt>__setstate__</tt> as described
in the following. Note that Boost.Python is also fully compatible
with Python's cPickle module.
<dl>
<dt><strong><tt>__getinitargs__</tt></strong></dt>
<hr>
<h2>The Boost.Python Pickle Interface</h2>
<dd>
When an instance of a Boost.Python extension class is pickled, the
pickler tests if the instance has a <tt>__getinitargs__</tt> method.
This method must return a Python tuple (it is most convenient to use
a boost::python::tuple). When the instance is restored by the
unpickler, the contents of this tuple are used as the arguments for
the class constructor.
At the user level, the Boost.Python pickle interface involves three special
methods:
<p>If <tt>__getinitargs__</tt> is not defined, <tt>pickle.load</tt>
will call the constructor (<tt>__init__</tt>) without arguments;
i.e., the object must be default-constructible.</p>
</dd>
<dl>
<dt>
<strong><tt>__getinitargs__</tt></strong>
<dd>
When an instance of a Boost.Python extension class is pickled, the
pickler tests if the instance has a <tt>__getinitargs__</tt> method.
This method must return a Python tuple (it is most convenient to use
a boost::python::tuple). When the instance is restored by the
unpickler, the contents of this tuple are used as the arguments for
the class constructor.
<dt><strong><tt>__getstate__</tt></strong></dt>
<p>
If <tt>__getinitargs__</tt> is not defined, <tt>pickle.load</tt>
will call the constructor (<tt>__init__</tt>) without arguments;
i.e., the object must be default-constructible.
<dd>When an instance of a Boost.Python extension class is pickled, the
pickler tests if the instance has a <tt>__getstate__</tt> method. This
method should return a Python object representing the state of the
instance.</dd>
<p>
<dt>
<strong><tt>__getstate__</tt></strong>
<dt><strong><tt>__setstate__</tt></strong></dt>
<dd>
When an instance of a Boost.Python extension class is pickled, the
pickler tests if the instance has a <tt>__getstate__</tt> method.
This method should return a Python object representing the state of
the instance.
<dd>When an instance of a Boost.Python extension class is restored by
the unpickler (<tt>pickle.load</tt>), it is first constructed using the
result of <tt>__getinitargs__</tt> as arguments (see above).
Subsequently the unpickler tests if the new instance has a
<tt>__setstate__</tt> method. If so, this method is called with the
result of <tt>__getstate__</tt> (a Python object) as the argument.</dd>
</dl>The three special methods described above may be <tt>.def()</tt>'ed
individually by the user. However, Boost.Python provides an easy to use
high-level interface via the
<strong><tt>boost::python::pickle_suite</tt></strong> class that also
enforces consistency: <tt>__getstate__</tt> and <tt>__setstate__</tt>
must be defined as pairs. Use of this interface is demonstrated by the
following examples.
<hr />
<p>
<dt>
<strong><tt>__setstate__</tt></strong>
<h2>Examples</h2>There are three files in <tt>boost/libs/python/test</tt>
that show how to provide pickle support.
<hr />
<dd>
When an instance of a Boost.Python extension class is restored by the
unpickler (<tt>pickle.load</tt>), it is first constructed using the
result of <tt>__getinitargs__</tt> as arguments (see above). Subsequently
the unpickler tests if the new instance has a <tt>__setstate__</tt>
method. If so, this method is called with the result of
<tt>__getstate__</tt> (a Python object) as the argument.
<h3><a href="../../test/pickle1.cpp"><tt>pickle1.cpp</tt></a></h3>The C++
class in this example can be fully restored by passing the appropriate
argument to the constructor. Therefore it is sufficient to define the
pickle interface method <tt>__getinitargs__</tt>. This is done in the
following way:
</dl>
The three special methods described above may be <tt>.def()</tt>'ed
individually by the user. However, Boost.Python provides an easy to use
high-level interface via the
<strong><tt>boost::python::pickle_suite</tt></strong> class that also
enforces consistency: <tt>__getstate__</tt> and <tt>__setstate__</tt>
must be defined as pairs. Use of this interface is demonstrated by the
following examples.
<hr>
<h2>Examples</h2>
There are three files in
<tt>boost/libs/python/test</tt> that show how to
provide pickle support.
<hr>
<h3><a href="../../test/pickle1.cpp"><tt>pickle1.cpp</tt></a></h3>
The C++ class in this example can be fully restored by passing the
appropriate argument to the constructor. Therefore it is sufficient
to define the pickle interface method <tt>__getinitargs__</tt>.
This is done in the following way:
<ul>
<li>1. Definition of the C++ pickle function:
<pre>
<ul>
<li>1. Definition of the C++ pickle function:
<pre>
struct world_pickle_suite : boost::python::pickle_suite
{
static
@@ -117,26 +98,28 @@ provide pickle support.
}
};
</pre>
<li>2. Establishing the Python binding:
<pre>
</li>
<li>2. Establishing the Python binding:
<pre>
class_&lt;world&gt;("world", args&lt;const std::string&amp;&gt;())
// ...
.def_pickle(world_pickle_suite())
// ...
</pre>
</ul>
</li>
</ul>
<hr />
<hr>
<h3><a href="../../test/pickle2.cpp"><tt>pickle2.cpp</tt></a></h3>
<h3><a href="../../test/pickle2.cpp"><tt>pickle2.cpp</tt></a></h3>The C++
class in this example contains member data that cannot be restored by any
of the constructors. Therefore it is necessary to provide the
<tt>__getstate__</tt>/<tt>__setstate__</tt> pair of pickle interface
methods:
The C++ class in this example contains member data that cannot be
restored by any of the constructors. Therefore it is necessary to
provide the <tt>__getstate__</tt>/<tt>__setstate__</tt> pair of
pickle interface methods:
<ul>
<li>1. Definition of the C++ pickle functions:
<pre>
<ul>
<li>1. Definition of the C++ pickle functions:
<pre>
struct world_pickle_suite : boost::python::pickle_suite
{
static
@@ -161,92 +144,76 @@ provide pickle support.
}
};
</pre>
<li>2. Establishing the Python bindings for the entire suite:
<pre>
</li>
<li>2. Establishing the Python bindings for the entire suite:
<pre>
class_&lt;world&gt;("world", args&lt;const std::string&amp;&gt;())
// ...
.def_pickle(world_pickle_suite())
// ...
</pre>
</ul>
</li>
</ul>
<p>
For simplicity, the <tt>__dict__</tt> is not included in the result
of <tt>__getstate__</tt>. This is not generally recommended, but a
valid approach if it is anticipated that the object's
<tt>__dict__</tt> will always be empty. Note that the safety guard
described below will catch the cases where this assumption is violated.
<p>For simplicity, the <tt>__dict__</tt> is not included in the result of
<tt>__getstate__</tt>. This is not generally recommended, but a valid
approach if it is anticipated that the object's <tt>__dict__</tt> will
always be empty. Note that the safety guard described below will catch
the cases where this assumption is violated.</p>
<hr />
<hr>
<h3><a href="../../test/pickle3.cpp"><tt>pickle3.cpp</tt></a></h3>
<h3><a href="../../test/pickle3.cpp"><tt>pickle3.cpp</tt></a></h3>This
example is similar to <a href=
"../../test/pickle2.cpp"><tt>pickle2.cpp</tt></a>. However, the object's
<tt>__dict__</tt> is included in the result of <tt>__getstate__</tt>.
This requires a little more code but is unavoidable if the object's
<tt>__dict__</tt> is not always empty.
<hr />
This example is similar to <a
href="../../test/pickle2.cpp"><tt>pickle2.cpp</tt></a>. However, the
object's <tt>__dict__</tt> is included in the result of
<tt>__getstate__</tt>. This requires a little more code but is
unavoidable if the object's <tt>__dict__</tt> is not always empty.
<h2>Pitfall and Safety Guard</h2>The pickle protocol described above has
an important pitfall that the end user of a Boost.Python extension module
might not be aware of:
<hr>
<h2>Pitfall and Safety Guard</h2>
<p><strong><tt>__getstate__</tt> is defined and the instance's
<tt>__dict__</tt> is not empty.</strong></p>
The pickle protocol described above has an important pitfall that the
end user of a Boost.Python extension module might not be aware of:
<p>
<strong>
<tt>__getstate__</tt> is defined and the instance's <tt>__dict__</tt>
is not empty.
</strong>
<p>
<p>The author of a Boost.Python extension class might provide a
<tt>__getstate__</tt> method without considering the possibilities
that:</p>
The author of a Boost.Python extension class might provide a
<tt>__getstate__</tt> method without considering the possibilities
that:
<ul>
<li>his class is used in Python as a base class. Most likely the
<tt>__dict__</tt> of instances of the derived class needs to be pickled
in order to restore the instances correctly.</li>
<p>
<ul>
<li>
his class is used in Python as a base class. Most likely the
<tt>__dict__</tt> of instances of the derived class needs to be
pickled in order to restore the instances correctly.
<li>the user adds items to the instance's <tt>__dict__</tt> directly.
Again, the <tt>__dict__</tt> of the instance then needs to be
pickled.</li>
</ul>
<p>
<li>
the user adds items to the instance's <tt>__dict__</tt> directly.
Again, the <tt>__dict__</tt> of the instance then needs to be
pickled.
</ul>
<p>
To alert the user to this highly unobvious problem, a safety guard is
provided. If <tt>__getstate__</tt> is defined and the instance's
<tt>__dict__</tt> is not empty, Boost.Python tests if the class has
an attribute <tt>__getstate_manages_dict__</tt>. An exception is
raised if this attribute is not defined:
<pre>
<p>To alert the user to this highly unobvious problem, a safety guard is
provided. If <tt>__getstate__</tt> is defined and the instance's
<tt>__dict__</tt> is not empty, Boost.Python tests if the class has an
attribute <tt>__getstate_manages_dict__</tt>. An exception is raised if
this attribute is not defined:</p>
<pre>
RuntimeError: Incomplete pickle support (__getstate_manages_dict__ not set)
</pre>
To resolve this problem, it should first be established that the
<tt>__getstate__</tt> and <tt>__setstate__</tt> methods manage the
instances's <tt>__dict__</tt> correctly. Note that this can be done
either at the C++ or the Python level. Finally, the safety guard
should intentionally be overridden. E.g. in C++ (from
<a href="../../test/pickle3.cpp"><tt>pickle3.cpp</tt></a>):
<pre>
</pre>To resolve this problem, it should first be established that the <tt>
__getstate__</tt> and <tt>__setstate__</tt> methods manage the
instances's <tt>__dict__</tt> correctly. Note that this can be done
either at the C++ or the Python level. Finally, the safety guard should
intentionally be overridden. E.g. in C++ (from <a href=
"../../test/pickle3.cpp"><tt>pickle3.cpp</tt></a>):
<pre>
struct world_pickle_suite : boost::python::pickle_suite
{
// ...
static bool getstate_manages_dict() { return true; }
};
</pre>
Alternatively in Python:
<pre>
</pre>Alternatively in Python:
<pre>
import your_bpl_module
class your_class(your_bpl_module.your_class):
__getstate_manages_dict__ = 1
@@ -255,54 +222,41 @@ is not empty.
def __setstate__(self, state):
# your code here
</pre>
<hr />
<hr>
<h2>Practical Advice</h2>
<h2>Practical Advice</h2>
<ul>
<li>
In Boost.Python extension modules with many extension classes,
providing complete pickle support for all classes would be a
significant overhead. In general complete pickle support should
only be implemented for extension classes that will eventually
be pickled.
<ul>
<li>In Boost.Python extension modules with many extension classes,
providing complete pickle support for all classes would be a
significant overhead. In general complete pickle support should only be
implemented for extension classes that will eventually be pickled.</li>
<p>
<li>
Avoid using <tt>__getstate__</tt> if the instance can also be
reconstructed by way of <tt>__getinitargs__</tt>. This automatically
avoids the pitfall described above.
<li>Avoid using <tt>__getstate__</tt> if the instance can also be
reconstructed by way of <tt>__getinitargs__</tt>. This automatically
avoids the pitfall described above.</li>
<p>
<li>
If <tt>__getstate__</tt> is required, include the instance's
<tt>__dict__</tt> in the Python object that is returned.
<li>If <tt>__getstate__</tt> is required, include the instance's
<tt>__dict__</tt> in the Python object that is returned.</li>
</ul>
<hr />
</ul>
<h2>Light-weight alternative: pickle support implemented in Python</h2>
<hr>
<h2>Light-weight alternative: pickle support implemented in Python</h2>
<h3><a href="../../test/pickle4.cpp"><tt>pickle4.cpp</tt></a></h3>
The <tt>pickle4.cpp</tt> example demonstrates an alternative technique
for implementing pickle support. First we direct Boost.Python via
the <tt>class_::enable_pickling()</tt> member function to define only
the basic attributes required for pickling:
<pre>
<h3><a href="../../test/pickle4.cpp"><tt>pickle4.cpp</tt></a></h3>The
<tt>pickle4.cpp</tt> example demonstrates an alternative technique for
implementing pickle support. First we direct Boost.Python via the
<tt>class_::enable_pickling()</tt> member function to define only the
basic attributes required for pickling:
<pre>
class_&lt;world&gt;("world", args&lt;const std::string&amp;&gt;())
// ...
.enable_pickling()
// ...
</pre>
This enables the standard Python pickle interface as described
in the Python documentation. By &quot;injecting&quot; a
<tt>__getinitargs__</tt> method into the definition of the wrapped
class we make all instances pickleable:
<pre>
</pre>This enables the standard Python pickle interface as described in the
Python documentation. By "injecting" a <tt>__getinitargs__</tt> method into
the definition of the wrapped class we make all instances pickleable:
<pre>
# import the wrapped world class
from pickle4_ext import world
@@ -312,18 +266,15 @@ class we make all instances pickleable:
# now inject __getinitargs__ (Python is a dynamic language!)
world.__getinitargs__ = world_getinitargs
</pre>
</pre>See also the <a href=
"../tutorial/doc/html/python/techniques.html#python.extending_wrapped_objects_in_python">
tutorial section</a> on injecting additional methods from Python.
<hr />
© Copyright Ralf W. Grosse-Kunstleve 2001-2004. Distributed under the
Boost Software License, Version 1.0. (See accompanying file
LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
See also the
<a href="../tutorial/doc/html/python/techniques.html#python.extending_wrapped_objects_in_python"
>tutorial section</a> on injecting additional methods from Python.
<hr>
&copy; Copyright Ralf W. Grosse-Kunstleve 2001-2004. Distributed under
the Boost Software License, Version 1.0. (See accompanying file
LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
<p>
Updated: Feb 2004.
</div>
<p>Updated: Feb 2004.</p>
</div>
</body>
</html>

View File

@@ -17,6 +17,7 @@ struct const_attribute_policies
{
typedef char const* key_type;
static object get(object const& target, char const* key);
static object get(object const& target, object const& key);
};
struct attribute_policies : const_attribute_policies
@@ -25,6 +26,18 @@ struct attribute_policies : const_attribute_policies
static void del(object const&target, char const* key);
};
struct const_objattribute_policies
{
typedef object const key_type;
static object get(object const& target, object const& key);
};
struct objattribute_policies : const_objattribute_policies
{
static object const& set(object const& target, object const& key, object const& value);
static void del(object const&target, object const& key);
};
//
// implementation
//
@@ -42,11 +55,30 @@ inline const_object_attribute object_operators<U>::attr(char const* name) const
return const_object_attribute(x, name);
}
template <class U>
inline object_objattribute object_operators<U>::attr(object const& name)
{
object_cref2 x = *static_cast<U*>(this);
return object_objattribute(x, name);
}
template <class U>
inline const_object_objattribute object_operators<U>::attr(object const& name) const
{
object_cref2 x = *static_cast<U const*>(this);
return const_object_objattribute(x, name);
}
inline object const_attribute_policies::get(object const& target, char const* key)
{
return python::getattr(target, key);
}
inline object const_objattribute_policies::get(object const& target, object const& key)
{
return python::getattr(target, key);
}
inline object const& attribute_policies::set(
object const& target
, char const* key
@@ -56,6 +88,15 @@ inline object const& attribute_policies::set(
return value;
}
inline object const& objattribute_policies::set(
object const& target
, object const& key
, object const& value)
{
python::setattr(target, key, value);
return value;
}
inline void attribute_policies::del(
object const& target
, char const* key)
@@ -63,6 +104,13 @@ inline void attribute_policies::del(
python::delattr(target, key);
}
inline void objattribute_policies::del(
object const& target
, object const& key)
{
python::delattr(target, key);
}
}}} // namespace boost::python::api
#endif // OBJECT_ATTRIBUTES_DWA2002615_HPP

View File

@@ -59,6 +59,8 @@ namespace api
struct const_attribute_policies;
struct attribute_policies;
struct const_objattribute_policies;
struct objattribute_policies;
struct const_item_policies;
struct item_policies;
struct const_slice_policies;
@@ -67,6 +69,8 @@ namespace api
typedef proxy<const_attribute_policies> const_object_attribute;
typedef proxy<attribute_policies> object_attribute;
typedef proxy<const_objattribute_policies> const_object_objattribute;
typedef proxy<objattribute_policies> object_objattribute;
typedef proxy<const_item_policies> const_object_item;
typedef proxy<item_policies> object_item;
typedef proxy<const_slice_policies> const_object_slice;
@@ -108,6 +112,8 @@ namespace api
//
const_object_attribute attr(char const*) const;
object_attribute attr(char const*);
const_object_objattribute attr(object const&) const;
object_objattribute attr(object const&);
// item access
//

View File

@@ -8,7 +8,7 @@
// http://www.boost.org/LICENSE_1_0.txt)
//
// Based on boost/ref.hpp, thus:
// Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)
// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
// Copyright (C) 2001 Peter Dimov
# if _MSC_VER+0 >= 1020

View File

@@ -11,6 +11,7 @@
# include <boost/operators.hpp>
# include <typeinfo>
# include <cstring>
# include <ostream>
# include <boost/static_assert.hpp>
# include <boost/detail/workaround.hpp>
# include <boost/type_traits/same_traits.hpp>

View File

@@ -68,8 +68,9 @@ struct with_custodian_and_ward : BasePolicy_
bool result = BasePolicy_::precall(args_);
if (!result)
if (!result) {
Py_DECREF(life_support);
}
return result;
}

View File

@@ -13,6 +13,7 @@
# endif
# ifdef _MSC_VER
# include <eh.h> // for _set_se_translator()
# pragma warning(push)
# pragma warning(disable:4297)
# pragma warning(disable:4535)

View File

@@ -38,26 +38,61 @@ object obj_getattr(object x, char const* name)
return x.attr(name);
}
object obj_objgetattr(object x, object const& name)
{
return x.attr(name);
}
object obj_const_getattr(object const& x, char const* name)
{
return x.attr(name);
}
object obj_const_objgetattr(object const& x, object const& name)
{
return x.attr(name);
}
void obj_setattr(object x, char const* name, object value)
{
x.attr(name) = value;
}
void obj_objsetattr(object x, object const& name, object value)
{
x.attr(name) = value;
}
void obj_setattr42(object x, char const* name)
{
x.attr(name) = 42;
}
void obj_objsetattr42(object x, object const& name)
{
x.attr(name) = 42;
}
void obj_moveattr(object& x, char const* src, char const* dst)
{
x.attr(dst) = x.attr(src);
}
void obj_objmoveattr(object& x, object const& src, object const& dst)
{
x.attr(dst) = x.attr(src);
}
void obj_delattr(object x, char const* name)
{
x.attr(name).del();
}
void obj_objdelattr(object x, object const& name)
{
x.attr(name).del();
}
object obj_getitem(object x, object key)
{
return x[key];
@@ -108,11 +143,21 @@ bool test_attr(object y, char* name)
return y.attr(name);
}
bool test_objattr(object y, object& name)
{
return y.attr(name);
}
bool test_not_attr(object y, char* name)
{
return !y.attr(name);
}
bool test_not_objattr(object y, object& name)
{
return !y.attr(name);
}
bool test_item(object y, object key)
{
return y[key];
@@ -301,11 +346,17 @@ BOOST_PYTHON_MODULE(object_ext)
def("number", number);
def("obj_getattr", obj_getattr);
def("obj_objgetattr", obj_objgetattr);
def("obj_const_getattr", obj_const_getattr);
def("obj_const_objgetattr", obj_const_objgetattr);
def("obj_setattr", obj_setattr);
def("obj_objsetattr", obj_objsetattr);
def("obj_setattr42", obj_setattr42);
def("obj_objsetattr42", obj_objsetattr42);
def("obj_moveattr", obj_moveattr);
def("obj_objmoveattr", obj_objmoveattr);
def("obj_delattr", obj_delattr);
def("obj_objdelattr", obj_objdelattr);
def("obj_getitem", obj_getitem);
def("obj_getitem3", obj_getitem);
@@ -319,7 +370,9 @@ BOOST_PYTHON_MODULE(object_ext)
def("test_not", test_not);
def("test_attr", test_attr);
def("test_objattr", test_objattr);
def("test_not_attr", test_not_attr);
def("test_not_objattr", test_not_objattr);
def("test_item", test_item);
def("test_not_item", test_not_item);

View File

@@ -34,29 +34,68 @@
>>> try: obj_getattr(x, 'foo')
... except AttributeError: pass
... else: print 'expected an exception'
>>> try: obj_objgetattr(x, 'objfoo')
... except AttributeError: pass
... else: print 'expected an exception'
>>> obj_setattr(x, 'foo', 1)
>>> x.foo
1
>>> obj_objsetattr(x, 'objfoo', 1)
>>> try:obj_objsetattr(x, 1)
... except TypeError: pass
... else: print 'expected an exception'
>>> x.objfoo
1
>>> obj_getattr(x, 'foo')
1
>>> obj_objgetattr(x, 'objfoo')
1
>>> try:obj_objgetattr(x, 1)
... except TypeError: pass
... else: print 'expected an exception'
>>> obj_const_getattr(x, 'foo')
1
>>> obj_const_objgetattr(x, 'objfoo')
1
>>> obj_setattr42(x, 'foo')
>>> x.foo
42
>>> obj_objsetattr42(x, 'objfoo')
>>> x.objfoo
42
>>> obj_moveattr(x, 'foo', 'bar')
>>> x.bar
42
>>> obj_objmoveattr(x, 'objfoo', 'objbar')
>>> x.objbar
42
>>> test_attr(x, 'foo')
1
>>> test_objattr(x, 'objfoo')
1
>>> test_not_attr(x, 'foo')
0
>>> test_not_objattr(x, 'objfoo')
0
>>> x.foo = None
>>> test_attr(x, 'foo')
0
>>> x.objfoo = None
>>> test_objattr(x, 'objfoo')
0
>>> test_not_attr(x, 'foo')
1
>>> test_not_objattr(x, 'objfoo')
1
>>> obj_delattr(x, 'foo')
>>> obj_objdelattr(x, 'objfoo')
>>> try:obj_delattr(x, 'foo')
... except AttributeError: pass
... else: print 'expected an exception'
>>> try:obj_objdelattr(x, 'objfoo')
... except AttributeError: pass
... else: print 'expected an exception'
Items