Newbie: what is a usefull IDE for Python on Windows ?

2006-12-23 Thread Osiris 
what is a usefull IDE for Python on Windows ?

I saw Eric mentioned.. is that WinXP  or Linux ?

What does "everybody" use ?

I was considering using old and very stable C-code in a new web
application via Python/Plone/Zope.
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Re: Newbie: what is a usefull IDE for Python on Windows ?

2006-12-23 Thread Osiris 
btw:
my system is an AMD 1.8 GHz, 512 Mbyte with WinXPSP2.
 I saw that a system like Wing would be sluggish ...
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Re: Newbie: what is a usefull IDE for Python on Windows ?

2006-12-23 Thread Osiris 
ok, thnx. Thread closed :-)
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Combining C and Python

2006-12-27 Thread Osiris 
I found this text about combining C-code with Pyton scripting on the
P2P networks in PDF:

Python Scripting for Computational Science
Hans Petter Langtangen
Simula Research Laboratory
and
Department of Informatics
University of Oslo


amazon and others have it in print.
software for the text is here:
http://folk.uio.no/hpl/scripting/

if you  want to download the 1st edition from
http://folk.uio.no/hpl/scripting/
the password (first word on page 92)  is "leads" (no quotes)


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Feasible in Python ? list of object , with two exeptional objects

2006-12-27 Thread Osiris 
Is the following intuitively feasible in Python:
I have an array (I come from C) of identical objects, called sections.
These sections have some feature, say a length, measured in mm, which
is calculated by a method A_length of the instantiation of the
Section's class.
Only, two elements in the array (or list ?) have a length that must be
calculated according to a totally different procedure, a different
function or method.
After calculation of ALL the lengths, they must be added together and
output.
The calculation procedure screams for a FOR or a WHILE loop allong the
list of sections, only those two sections mentioned make life
difficult.

I was thinking along the line of building a class Section, instantiate
a list of objects of this class, and then replace 2 of the elements of
the list by instantiations of the special class...
Or maybe replace only the method in question by the special method... 
It would be neat, if I could just walk the FOR loop, constructing the
list and calculate the total length in one go...

Concretely, the situation is a Plone site that passes user "section"
data to  a Python / C server-side to do calculations on the section
data and return the result over the web.
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Re: Combining C and Python

2006-12-27 Thread Osiris 
On Wed, 27 Dec 2006 16:12:02 +0100, Osiris <[EMAIL PROTECTED]> wrote:

>I found this text about combining C-code with Pyton scripting on the
>P2P networks in PDF:
>
>Python Scripting for Computational Science
>Hans Petter Langtangen
>Simula Research Laboratory
>and
>Department of Informatics
>University of Oslo
>
>
>amazon and others have it in print.
>software for the text is here:
>http://folk.uio.no/hpl/scripting/
>
>if you  want to download the 1st edition from
>http://folk.uio.no/hpl/scripting/
>the password (first word on page 92)  is "leads" (no quotes)
>

and for the second edition the password is "function"
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Re: Feasible in Python ? list of object , with two exeptional objects

2006-12-28 Thread Osiris 
On Wed, 27 Dec 2006 23:27:08 +0100, Marc 'BlackJack' Rintsch
<[EMAIL PROTECTED]> wrote:

>In <[EMAIL PROTECTED]>, Osiris wrote:
>
>> I have an array (I come from C) of identical objects, called sections.
>> These sections have some feature, say a length, measured in mm, which
>> is calculated by a method A_length of the instantiation of the
>> Section's class.
>> Only, two elements in the array (or list ?) have a length that must be
>> calculated according to a totally different procedure, a different
>> function or method.
>
>Is this something that the instances of section "know" or is some external
>"knowledge" needed to identify those special objects?

the sections know, beforehand. I can write the method NOW.
>
>> After calculation of ALL the lengths, they must be added together and
>> output.
>> The calculation procedure screams for a FOR or a WHILE loop allong the
>> list of sections, only those two sections mentioned make life
>> difficult.
>
>Sounds like something like ``sum(section.length() for section in sections)``.
>
>Your description is a bit vague.  Where and how do you start to treat the
>objects different.

I create all sections, also the differeent one. I know all along which
is differeent.

>  Is it possible to decide at instantiation time to
>create a `Section` object or a `SpecialSection` object?  How much

YES

>different is the calculation?

rather al lot.

>  Do you need two separate classes or just
>one with a flag or maybe a function as argument to the `__init__()`

is differenter than that..

>method?  Are you writing the `Section` class(es) just for this
>calculation or do they contain other behavior too?
>

They have a lot of other behavior too...

>Ciao,
>   Marc 'BlackJack' Rintsch
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Re: Feasible in Python ? list of object , with two exeptional objects

2006-12-28 Thread Osiris 
On Wed, 27 Dec 2006 16:29:29 -0600, "Paul McGuire"
<[EMAIL PROTECTED]> wrote:

>"Osiris" <[EMAIL PROTECTED]> wrote in message 
>news:[EMAIL PROTECTED]
>> Is the following intuitively feasible in Python:
>> I have an array (I come from C) of identical objects, called sections.
>> These sections have some feature, say a length, measured in mm, which
>> is calculated by a method A_length of the instantiation of the
>> Section's class.
>> Only, two elements in the array (or list ?) have a length that must be
>> calculated according to a totally different procedure, a different
>> function or method.
>> After calculation of ALL the lengths, they must be added together and
>> output.
>> The calculation procedure screams for a FOR or a WHILE loop allong the
>> list of sections, only those two sections mentioned make life
>> difficult.
>>
>
>Any reason you don't just use simple inheritance?
>
>
>from random import choice
>class BasicSection(object):
>def __str__(self):
>return "%s: %s" % (self.__class__.__name__, self.A_length())
>
>class OrdinarySection(BasicSection):
>def __init__(self):
># boring numbers
>self.mundaneLengthValue = choice(range(10))
>def A_length(self):
>return self.mundaneLengthValue
>
>class ExceptionalSection(BasicSection):
>def __init__(self):
># exceptional numbers!
>self.extraordinaryLengthValue = 
>choice([1.414,3.14159,2.71828,1.6180339,])
>def A_length(self):
>return self.extraordinaryLengthValue
>
># create list of Sections, randomly choosing Ordinary or Exceptional ones
>listOfSections = [ choice( (OrdinarySection,ExceptionalSection) )()
>for i in range(10) ]
>
># now iterate over the list and get length for each
>totalLength = 0
>for sec in listOfSections:
>print "Adding length of " + str(sec)
>totalLength += sec.A_length()
>print "total =", totalLength
>
># or more Pythonically, use a generator expression
>totalLength = sum( sec.A_length() for sec in listOfSections )
>print "total =", totalLength
>
>One sample run gives this result (although because we randomly choose which 
>class to create when adding elements to the list, the results are different 
>every time):
>Adding length of OrdinarySection: 6
>Adding length of OrdinarySection: 2
>Adding length of OrdinarySection: 0
>Adding length of OrdinarySection: 4
>Adding length of OrdinarySection: 1
>Adding length of ExceptionalSection: 3.14159
>Adding length of OrdinarySection: 4
>Adding length of ExceptionalSection: 3.14159
>Adding length of ExceptionalSection: 2.71828
>Adding length of ExceptionalSection: 1.414
>total = 27.41546
>total = 27.41546
>
>
>In truth, it is not even necessary for both classes to subclass from 
>BasicSubject (as would be the case in C++ or Java).  Python's duck-typing 
>will take any object that implements A_length() - I just created a common 
>superclass to put the __str__ method in, and to more classically follow 
>common inheritance patterns.
>
>-- Paul 
>

Thank you for your elaborate answer.
This indeed gives me an idea of how it would be possible.
What you say is, that I would make two entirely separate classes.
Now, the classes are going to be big: lots of methods and attributes.
A lot of the methods are going to be identical, only a few (crucial
ones) will be special.
Would I put all the stuff that is the same in both classes in the base
class and only the differing stuff in the subclasses ?
=
class Super:  # a big super class
def methodA etc
def methodX etc

class normalSection(Super): # two small subclasses
   def length etc

class SpecialSection(Super):
  def length etc.

listOfSections =
[normalSection,normalSection,specialSection,specialSection,normalSection]

for section in ListOfSections:
   total += section.length() 
   someOtherTotal += section.MethodA() 
===

Could I move the normal length method to the superclass, and override
it in the special class,  like this:

===
class Super:  # a big base class
def methodA etc
def methodX etc
def length etc

class normalSection(Super): # not needed anymore

class SpecialSection(Super): # just the special stuff in here, 
  def length etc.# overriding the base class

listOfSections = [Super, Super, Super, SpecialSection, Super]
==

Some background:
Always when I dive into a new language (after Fortran, Basic, Pascal,
Forth, ASM's, C, Java(script), PHP etc.) I take a known
problem/program and try to do it in the new language, so I can
concen

Re: Combining C and Python

2006-12-28 Thread Osiris 
On Thu, 28 Dec 2006 08:48:53 +0100, Osiris <[EMAIL PROTECTED]> wrote:

>On Wed, 27 Dec 2006 16:12:02 +0100, Osiris <[EMAIL PROTECTED]> wrote:
>
>>I found this text about combining C-code with Pyton scripting on the
>>P2P networks in PDF:
>>
>>Python Scripting for Computational Science
>>Hans Petter Langtangen
>>Simula Research Laboratory
>>and
>>Department of Informatics
>>University of Oslo
>>
>>
>>amazon and others have it in print.
>>software for the text is here:
>>http://folk.uio.no/hpl/scripting/
>>
>>if you  want to download the 1st edition from
>>http://folk.uio.no/hpl/scripting/
>>the password (first word on page 92)  is "leads" (no quotes)
>>
>
>and for the second edition the password is "function"

oh, and the PDF password is "foo"
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Re: Feasible in Python ? list of object , with two exeptional objects

2006-12-28 Thread Osiris 
On Thu, 28 Dec 2006 11:14:27 +0100, Marc 'BlackJack' Rintsch
<[EMAIL PROTECTED]> wrote:

>In <[EMAIL PROTECTED]>, Osiris wrote:
>
>> Would I put all the stuff that is the same in both classes in the base
>> class and only the differing stuff in the subclasses ?
>
>Yes that's the intent of base/sub class relationships.  Baseclasses
>contain the behavior common to all their subclasses and subclasses
>implement just the different or additional behavior.
>
>> Could I move the normal length method to the superclass, and override
>> it in the special class,  like this:
>
>Yes that can be done and makes perfectly sense if the `length()` in the
>baseclass is the "normal" behavior and that baseclass can be instantiated
>and used directly.
>
>Ciao,
>   Marc 'BlackJack' Rintsch


 now we're rolling ! :-)
thnx both.
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python , Boost and straight (but complex) C code

2006-12-30 Thread Osiris 
I have these pieces of C-code (NOT C++ !!) I want to call from Python.
I found Boost.
I have MS Visual Studio 2005 with C++.

is this the idea:
I write the following C source file:

#include 
#include 

namespace { // Avoid cluttering the global namespace.

int my_int;   /* a global integer: or outside namespace ? */
 double calc ( double f)
 {
my_int = (int) (f/2);
printf( "Half of %f is %d\n", f, my_int ); 
return f/2;
 }
 
}

#include 
using namespace boost::python;

BOOST_PYTHON_MODULE( half )
{
def("calc", calc ); 
}



Which I put in a VC project and compile into a .DLL
This DLL I put somewhere on my disk, where Python 2.4 can find it.
then I write the following Python source:
=
from half import *
calc(34655.0)

et voila ?

Can I acces my_int too, this way ?

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Re: python , Boost and straight (but complex) C code

2006-12-30 Thread Osiris 
I get, from Visual C++, these linker errors, 8 in total, trying to
build the above C++ source:

C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) void __cdecl
boost::python::detail::init_module(char const *,void
(__cdecl*)(void))"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]) referenced in
function _inithalf

C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) void __cdecl
boost::python::detail::scope_setattr_doc(char const *,class
boost::python::api::object const &,char const *)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@[EMAIL PROTECTED]@Z)
referenced in function "void __cdecl boost::python::def(char const *,int (__cdecl*)(float))"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@boost@@[EMAIL PROTECTED]@Z)

C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) class boost::python::api::object __cdecl
boost::python::objects::function_object(struct
boost::python::objects::py_function const &)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@[EMAIL 
PROTECTED]@123@@Z)
referenced in function "class boost::python::api::object __cdecl
boost::python::detail::make_function_aux >(int (__cdecl*)(float),struct
boost::python::default_call_policies const &,struct
boost::mpl::vector2 const &)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@boost@@[EMAIL PROTECTED]@[EMAIL 
PROTECTED]@@[EMAIL PROTECTED]@boost@@[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL 
PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@@Z)
C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) public: __thiscall
boost::python::objects::py_function_impl_base::py_function_impl_base(void)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED])
referenced in function "public: __thiscall
boost::python::objects::caller_py_function_impl > >::caller_py_function_impl > >(struct
boost::python::detail::caller > const &)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL 
PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@boost@@@[EMAIL 
PROTECTED]@boost@@[EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL 
PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@@Z)
C_test.obj : error LNK2001: unresolved external symbol "public:
virtual unsigned int __thiscall
boost::python::objects::py_function_impl_base::max_arity(void)const "
([EMAIL PROTECTED]@[EMAIL PROTECTED]@boost@@UBEIXZ)
C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) public: virtual __thiscall
boost::python::objects::py_function_impl_base::~py_function_impl_base(void)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED])
referenced in function "public: virtual __thiscall
boost::python::objects::caller_py_function_impl > >::~caller_py_function_impl > >(void)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL 
PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@boost@@@[EMAIL 
PROTECTED]@boost@@[EMAIL PROTECTED])
C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) struct
boost::python::converter::rvalue_from_python_stage1_data __cdecl
boost::python::converter::rvalue_from_python_stage1(struct _object
*,struct boost::python::converter::registration const &)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL PROTECTED]@PAU_object@@[EMAIL 
PROTECTED]@@Z)
referenced in function "public: __thiscall
boost::python::converter::arg_rvalue_from_python::arg_rvalue_from_python(struct
_object *)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@boost@@[EMAIL PROTECTED]@@@Z)
C_test.obj : error LNK2019: unresolved external symbol
"__declspec(dllimport) struct boost::python::converter::registration
const & __cdecl boost::python::converter::registry::lookup(struct
boost::python::type_info)"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@boost@@[EMAIL PROTECTED]@[EMAIL 
PROTECTED]@@Z)
referenced in function "struct boost::python::converter::registration
const & __cdecl
boost::python::converter::detail::registry_lookup(float const volatile & (__cdecl*)(void))"
([EMAIL PROTECTED]@[EMAIL PROTECTED]@[EMAIL PROTECTED]@@[EMAIL 
PROTECTED]@[EMAIL PROTECTED])
C:\Documents and Settings\Erik\My Documents\Visual Studio
2005\Projects\C_test\Debug\C_test.dll : fatal error LNK1120: 8
unresolved externals
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Re: python , Boost and straight (but complex) C code

2006-12-30 Thread Osiris 
Visual C++ build log at:

http://213.10.133.192/BuildLog.htm
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Re: python , Boost and straight (but complex) C code

2006-12-30 Thread Osiris 
On Sat, 30 Dec 2006 13:19:28 -0800, Erik Max Francis <[EMAIL PROTECTED]>
wrote:

>Osiris wrote:
>
>> I have these pieces of C-code (NOT C++ !!) I want to call from Python.
>> I found Boost.
>> I have MS Visual Studio 2005 with C++.
>> 
>> is this the idea:
>> I write the following C source file:
>> 
>> #include 
>> #include 
>> 
>> namespace { // Avoid cluttering the global namespace.
>
>iostream and namespaces are both most definitely C++ features, not C.

yes, but C can be compiled with a C++ compiler,  One can put C code in
C++ source Boost should not complain... should it ?
Boost text is all about C++.. so... C should not be a problem...
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Re: python , Boost and straight (but complex) C code

2006-12-31 Thread Osiris 
On Sun, 31 Dec 2006 01:01:29 +0100, Christophe Cavalaria
<[EMAIL PROTECTED]> wrote:

>Osiris wrote:
>
>> On Sat, 30 Dec 2006 13:19:28 -0800, Erik Max Francis <[EMAIL PROTECTED]>
>> wrote:
>> 
>>>Osiris wrote:
>>>
>>>> I have these pieces of C-code (NOT C++ !!) I want to call from Python.
>>>> I found Boost.
>>>> I have MS Visual Studio 2005 with C++.
>>>> 
>>>> is this the idea:
>>>> I write the following C source file:
>>>> 
>>>> #include 
>>>> #include 
>>>> 
>>>> namespace { // Avoid cluttering the global namespace.
>>>
>>>iostream and namespaces are both most definitely C++ features, not C.
>> 
>> yes, but C can be compiled with a C++ compiler,  One can put C code in
>> C++ source Boost should not complain... should it ?
>> Boost text is all about C++.. so... C should not be a problem...
>
>Not all C code can be compiled by a C++ compiler. And anyway, this is
>definitively NOT C code.

ok ok, 
but the examples of the application of boost only show how to do C++.
So I followed those examples and try to embed my C code in the
framework of the examples...
Which seems not to be without merit, because my example here compiles
ok, but the linking into a DLL goes wrong, looking at the log.
I told VC where the boost libs are, and still
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Re: python , Boost and straight (but complex) C code

2006-12-31 Thread Osiris 
On Sat, 30 Dec 2006 23:35:22 +0200, "Roman Yakovenko"
<[EMAIL PROTECTED]> wrote:

>On 12/30/06, Osiris <[EMAIL PROTECTED]> wrote:
>> Visual C++ build log at:
>>
>> http://213.10.133.192/BuildLog.htm
>
>It is better to ask Boost.Python related questions on it mailing list:
>http://mail.python.org/mailman/listinfo/c++-sig/
>
>You should add to the link line boost_python.lib, thus you will eliminate
>"unresolved reference symbol" errors. If you did not build Boost.Python
>next page( http://boost.org/libs/python/doc/building.html ) contains pretty
>good explanation how to do this.

That explanation I find confusing:
"To build boost_python, use Boost.Build...": Where is boost.build and
what is it ?
in my D:\boost\libs\python\build there is no boost.build...

in D:\boost there is a build-boost.jam file Is that it ?

I have a D:\boost\libs\python\build\bin-stage\boost_python.dll (204kB
size) and a D:\boost\libs\python\build\bin-stage\boost_build.lib (163
KB)
I made them with Visual Studio...


I made a bjam, it is in C:\

In D:\boost\libs\python\build there are a bin_stage and  a
VisualStudio folder , the files
jamfile
jamfile.v2
python_v1.zip

Is it so, that I can build the boost_python.dll and lib, either with
bjam OR with VisualStudio C++ ?

Why are all those other folders there in d:\boost ? people,
regression, tools, status etc ?

What do I do with d:\boost\boost ? a lot of headers there...

what are all these folders in d:\boost\libs\ ?

In short: it's all rather confusing

I think it must be like this:

To use my C/C++ code with Python, add some stuff in the C/C++ source
and compile it into a DLL, that must be combined with some boost-DLL
to make it accessible to Python 2.4.
Therefore I need a boost DLL from boost.org, and some headerfiles that
belong to the boost DLL.
(where are those boost header files )

As you see, a lot of obfuscation
MAybe I see too many bears on the road...

>
>http://boost.org/libs/python/doc/v2/scope.html - here you will find example how
>to expose my_int variable to Python. my_int has type int, so C++ code will not
>see changes to the variable that are done from Python. You will have to write
>set_my_int( x ) function to achieve this.
>
>If you are new to Boost.Python try to use Py++ - the code generator for
>the library. The Py++ GUI( http://tinyurl.com/ycwvwo ) will help you
>to start\learn Boost.Python.
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BOOST again: how to proceed from here....

2007-01-01 Thread Osiris 
I'm trying to work with Boost, trying to use my C-code from Python..
So now I have generated a C_test2.dll and a C_test2.lib with Visual
C++ 2005, from code like this:
===
#include 
#include 

namespace { // Avoid cluttering the global namespace.

int my_int;   /* a global integer: or outside namespace ? */
 double calc ( double f)
 {
my_int = (int) (f/2);
 //   printf( "Half of %f is %d\n", f, my_int ); 
return f/2;
 }
 
}

#include 

using namespace boost::python;

BOOST_PYTHON_MODULE( half )
{
def("calc", calc ); 
}
=

Now I want to use calc from Python.
I have my Python in c:\python24\ (IDLE system, version 2.4.4)
Where do I put the dll and lib ?

in c:\python24\libs and c:\python24\DLLs ?

and do I import like:
import C_test2.dll 
?
because now I get this:

Traceback (most recent call last):
  File "", line 1, in -toplevel-
import C_test2.dll
ImportError: DLL load failed: The specified module could not be found.
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BOOST confuses me: a few assumptions: true or false.....

2007-01-01 Thread Osiris 
I read a lot of the html pages on installing boost etc. Still a lot of
confusion.

Here is what I want:
I have old, stable wonderful C-code I want to use in Python projects.
So I encapsulate the C-code in some C++ stuf and try to compile it
into a DLL.

1: I DL-ed boost_1_33_1.exe (I use WinXP) and unpacked to D:\boost
2: I started my MS Visual C++ 2005 and told the Studio that my
python2.4 includes and libs are at c:\python24\include and
c:\python24\libs
3: I found the project in D:\boost\libs\python\build\VisualStudio and
Studio converted that to the 8.0 version of my VC.
4: I compiled and got stuff in D:\boost\libs\python\build\bin-stage:
  208.896 boost_python.dll
 99.090 boost_python.exp
   166.216 boost_python.lib
532.480 boost_python_debug.dll
 99.102 boost_python_debug.exp
   168.490 boost_python_debug.lib
6.450.176 boost_python_debug.pdb
(the numbers are sizes)

Am I now set up to start on my own projects ?

Do I need bjam from here on ? or can I continue to do my own projects
in VC ?

do I need all the stuff in the folders  like D:\boost\libs\* (except
D:\boost\libs\python) ? they do not seem to be used till now...


here is an example of mine, to play around with:
However, I get the compile log (http://213.10.133.192/BuildLog.htm)


#include 
#include 

namespace { // Avoid cluttering the global namespace.

int my_int;   /* a global integer: or outside namespace ? */
 double calc ( double f)
 {
my_int = (int) (f/2);
 //   printf( "Half of %f is %d\n", f, my_int ); 
return f/2;
 }
 
}

#include 

using namespace boost::python;

BOOST_PYTHON_MODULE( half )
{
def("calc", calc ); 
}
-- 
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How to get BOOST working on XP and Visual C++ 2005

2007-01-02 Thread Osiris 
My experiences with BOOST on Windows XP and Visual C++ 2005

I'm new to Python.
I built software in more than ten other computer languages. I'm not
sure if that is not a handicap, when reading documentation of a system
like BOOST.
However:
It took me more than four full working days to get a Python/C/C++
'hello world!' program to work. There is a lot of documentation, but
somehow it did not 'click' with my previous experience. I think the
doc was written by very, very capable C++ and Python programmers, who
forgot how the world was before they got involved with Python.
A teacher/doc writer should never forget that, I think.
Mind you: the documentation is all there. Stressing the word ALL.
There is a lot of documentation. Which makes it very difficult to
choose the right piece.

My project is, to use old and tested and stable and error-free C-code
in a website built with Zope (www.zope.org) and Plone (www.plone.org).
So I think, C-code can be wrapped in some C++ and then, with the help
of Boost, be called from Python. Python is important when using Plone.

So let me summarize what I found out.

BOOST is a system to combine Python and C++. Call C++ compiled code
from Python, which is interpreted.
In the end, BOOST is a sort of "make" facility like found on Linux
(and Windows). In Boost it is called, not 'make.exe', but 'bjam.exe'.
You define a list of operations, which bjam executes for you. It runs
from the command line (I grew up, IT-wise, in the DOS-era. Hurray), it
has no GUI-like Windows front-end.

So the first step is to get bjam.exe from the net. There are two ways
to get it:
1.  download a ready-to-run bjam.exe from
http://downloads.sourceforge.net/boost/boost-jam-3.1.13-1-ntx86.zip?modtime=1149717367&big_mirror=0.
In the zip you will find the bjam.exe, which you put it in a place
where the system can always find it, like in c:\, or somewhere else in
the system's PATH.
2.  download the sources for bjam.exe and build it yourself:
http://downloads.sourceforge.net/boost/boost-jam-3.1.13.zip?modtime=1149717465&big_mirror=0
. I recommend not to do this, if you don't have to. And on Windows XP,
you don't have to. You could spend a lot of time to figure out how to
set up things before even building bjam.exe.

The second step is to get Boost libraries. These are for combining
with your C/C++ source, so Python can access the C/C++ code.
You download this stuff from Sourceforge:
http://downloads.sourceforge.net/boost/boost_1_33_1.zip?modtime=1133816391&big_mirror=0
It is a zip file that you unzip to a convenient location. I unzipped
to D:\ so I got a folder named d:\boost_1_31_1 with all the stuff in
it. I renamed this folder to d:\boost, to get rid of all the messy
version numbers.
To build the boost libraries from these sources, you need bjam, and
bjam makes use of your C/C++ compiler. In my case that was Microsoft
Visual C++ 2005, which has version number 8.0.
Now you have to make bjam and Visual C++ acquainted with the location
of supporting software. I made a BAT file to do this. This is what is
in that .BAT file, named SET.BAT and which I put in D:\boost:

d:
cd \boost
call e:\msvc\vc\vcvarsall.bat
set VC80_ROOT=e:\msvc\vc
set TOOLS=vc-8_0
set PYTHON_ROOT=c:\python24
set PYTHON_VERSION=2.4

I explain: 
e:\msvc is where I installed my Visual C++ system. The Microsoft
default location would be something like C:\Microsoft Visual C 2005\
etc, but I preferred D:\msvc.
Change the SET.BAT file as needed .
My IDLE (http://www.python.org/idle/) Python 2.4 is in C:\python24
The value 'vc-8_0' denotes the boost identification of my MS Visual
C++ system. If you use an other C++ system, it must be something else
(see http://www.boost.org/more/getting_started.html)

Now start a DOS box: Click the Start button in the lower left corner,
click on "run" and type "cmd".
There you switch to D:\ and change directory to \BOOST.
Execute the SET.BAT.
Then just type "bjam" (the system will find the program bjam itself,
because it is in the PATH)

Now get a lot of coffee, because the build will take a LONG time,
maybe 15 minutes or more.
You will see a lot of cpp-compiling and linking going on and some
warnings about 'deprecation', which are irrelevant.

When finished, keep the DOS box open. You will find BOOST stuff in
C:\boost, the default location for the compiling results.

Now try out an example. In the DOS box, go to
D:\boost\libs\python\example\tutorial, where you find a 'hello'
example and a Jamfile. Jamfile's are what a makefile is for make.: a
script for bjam to build all the 'hello' stuff needed for python.

Type 'bjam' again, and take a smaller amount of coffee. The system
will build the 'hello' stuff for you. Do not be alarmed about bjam
finding 1200+ 'targets' and rebuilding 40 of them, when only needing
to compile hello.cpp…. this is normal behaviour.

When bjam has finished, you will find 'hello' stuff in the
unbelievably deep folder
D:\boost\libs\python\example\tutorial\bin\tutorial\hello.pyd\vc-8_0\debu