Extending Python with C++

[jeremito]

I am learning how to extend Pythong with C++. I have will be writing
some code in C++ and want/need Python to interact with it. I am not
having success following the online documentation from
http://docs.python.org/ext/ext.html. I have also looked briefly at
some of the demos in the source code distribution. Can anyone help me?
I am using the MacPython (version 2.4) distribution.

I have one specific question. The documentation online states:

"If the main program (the Python interpreter) is compiled and linked by
the C compiler, global or static objects with constructors cannot be
used. This is not a problem if the main program is linked by the C++
compiler."

Thanks,
Jeremy

[Fredrik Lundh]

Re: Extending Python with C++

"jeremito" <jeremit0@gmail .com> wrote:
[color=blue]
> I have one specific question. The documentation online states:
>
> "If the main program (the Python interpreter) is compiled and linked by
> the C compiler, global or static objects with constructors cannot be
> used. This is not a problem if the main program is linked by the C++
> compiler."[/color]

what is the question ?

</F>

[jeremito]

Re: Extending Python with C++

Oops, sorry. My question is, how can I know if my Python interpreter
was lined by C++? The non-specific questions are, of course, does
anyone have any hints or suggestions? Good websites to visit?
Thanks,
Jeremy

[Brian van den Broek]

Re: Extending Python with C++

jeremito said unto the world upon 29/12/05 11:39 AM:[color=blue]
> I am learning how to extend Pythong with C++. I have will be writing
> some code in C++ and want/need Python to interact with it. I am not
> having success following the online documentation from
> http://docs.python.org/ext/ext.html. I have also looked briefly at
> some of the demos in the source code distribution. Can anyone help me?
> I am using the MacPython (version 2.4) distribution.
>
> I have one specific question. The documentation online states:
>
> "If the main program (the Python interpreter) is compiled and linked by
> the C compiler, global or static objects with constructors cannot be
> used. This is not a problem if the main program is linked by the C++
> compiler."
>
> Thanks,
> Jeremy[/color]

I have a specific answer.

Best,

Brian vdB

[Martin v. Löwis]

Re: Extending Python with C++

jeremito wrote:[color=blue]
> Oops, sorry. My question is, how can I know if my Python interpreter
> was lined by C++?[/color]

Ah. This documentation fragment is somewhat wrong: it depends on the
target operating system and compiler whether you have to link main
with a C++ compiler. For many modern systems, this isn't necessary.

Anyway, finding out whether the executable was linked with a C++
compiler is only possible with platform-dependent tools. For example,
on Linux and many Unix systems, ldd(1) will tell you whether a C++
library was linked into the binary; do 'ldd python'.
[color=blue]
> The non-specific questions are, of course, does
> anyone have any hints or suggestions?[/color]

You should really understand the concept of 'extern "C"' in C++.
That's all you need to know write Python extensions in C++.

Regards,
Martin

[Brian van den Broek]

Re: Extending Python with C++

Brian van den Broek said unto the world upon 29/12/05 12:03 PM:[color=blue]
> jeremito said unto the world upon 29/12/05 11:39 AM:
>[color=green]
>>I am learning how to extend Pythong with C++. I have will be writing
>>some code in C++ and want/need Python to interact with it. I am not
>>having success following the online documentation from
>>http://docs.python.org/ext/ext.html. I have also looked briefly at
>>some of the demos in the source code distribution. Can anyone help me?
>> I am using the MacPython (version 2.4) distribution.
>>
>>I have one specific question. The documentation online states:
>>
>>"If the main program (the Python interpreter) is compiled and linked by
>>the C compiler, global or static objects with constructors cannot be
>>used. This is not a problem if the main program is linked by the C++
>>compiler."
>>
>>Thanks,
>>Jeremy[/color]
>
>
> I have a specific answer.
>
> Best,
>
> Brian vdB[/color]


Hello all,

while I think the point I was making was correct, I know I expressed
it in a snide and unkind way. Apologies to all, especially to the OP.

Sheepishly,

Brian vdB

[jeremito]

Re: Extending Python with C++

Unfortunately, I need to know a bit more than just the concept 'extern
"C"'. I am really slow at this. Can anyone point me towards some
examples or a tutorial (other than the one from python.org, I didn't
understand that one)?
Thanks,
Jeremy