[capi-sig] Embedding basics

[Philip Semanchuk]

On Jun 28, 2012, at 4:35 PM, ecir hana wrote:

> 
> - How to build Python myself? "./configure" and "make" works but
> I'm afraid to do "make install" as it might mess with pre-installed Python,
> am I right? And it creates lots of .so, and no .a's. 
Hi Ecir,
It's been a while since I compiled Python, but in the README supplied with the source code it talks about installation options. By default it installs in the /usr/local tree which should not interfere with your system Python.

> Even if I somehow
> manage to build Python and test.c what if it uses some libraries? Do I have
> to somehow compile and link them to the one big executable as well or is it
> just matter of packing the libraries along the binary and setting the
> Python find path?

Installing Python will put the runtime libraries on your system. If you want to run your program on a system where Python isn't  installed, you need a 3rd party program like PyInstaller, Py2App, Py2Exe, bbfreeze, cx_freeze, etc.

Hope this helps
Philip




> 
> 
> 
> 
> On Thu, Jun 28, 2012 at 2:27 PM, Henrique <typoon at gmail.com> wrote:
> 
>> Hey Ecir,
>> 
>> By reading your email, I think you might want to first learn some basic
>> concepts about C programming and how a program can be linked to dynamic or
>> static libraries.
>> When Python is compiled in your machine, a dynamic or a static (or both)
>> library built, which you use to link with your program (your test.c). If
>> MacOS provides binaries for Python, I believe the libraries might alreayd
>> be there, and you might not need to compile it manually. (based on what you
>> are saying, you are only trying to compile it because you thought that is
>> how it should be done to have your test.c file to work). If you are still
>> interested in compiling it yourself, I believe there should be instructions
>> with the source (perhaps an INSTALL file there, explaining it). I am not
>> sure as I do not currently have the source here with me (but it should be
>> as simple as running ./configure && make && make install).
>> After you have Python compiled and running on your machine, you will write
>> source that will use the functions provided by the Python library in your
>> application, that is where your 'test.c' program comes into play.
>> 
>> Some time ago I wrote some introduction blog posts about the Python C API.
>> If you are interested, this might help you a little bit
>> http://www.gilgalab.com.br/2011/05/03/python-c-api-first-step/
>> http://www.gilgalab.com.br/2011/05/03/python-c-api-second-step/
>> 
>> But again, I really think you should look up some basics on C development
>> in a Unix platform :)
>> 
>> Regards,
>> 
>> Henrique
>> 
>> 
>> On Thu, Jun 28, 2012 at 6:08 AM, ecir hana <ecir.hana at gmail.com> wrote:
>> 
>>> Hello,
>>> 
>>> please, I have a bit of trouble grasping a few very basic concepts related
>>> to Python embedding, could someone explain those to me?
>>> 
>>> What I try to achieve is to have single one (big) binary, which contains
>>> my
>>> Python script, the wrapper and Python interpreter itself, I'm on MacOS
>>> 10.6. My questions are:
>>> 
>>> - I would like to build Python myself. I downloaded Python 3.3 beta source
>>> code, extracted it in a folder. Next to "Python-3.3.0b1" folder, there is
>>> a
>>> file "test.c" which contains:
>>> 
>>> #include <Python.h>
>>> 
>>> int
>>> main(int argc, char *argv[])
>>> {
>>> Py_Initialize();
>>> PyRun_SimpleString("from time import time,ctime\n"
>>>                    "print('Today is', ctime(time()))\n");
>>> Py_Finalize();
>>> return 0;
>>> }
>>> 
>>> Now, what should I do next? I though I would just "somehow" compile and
>>> link Python source code with test.c and that's it but when I do "gcc -I
>>> ./Python-3.3.0b1 -o test test.c" I get lots of errors. (Note: I'm total
>>> noob what this whole gcc and static linking and .a files goes...)
>>> 
>>> - Next I tried to run "./configure" and "make". It finished without errors
>>> and it creates "build/lib.macosx-10.6-x86_64-3.3" folder with lots of *.so
>>> (?) files but I'm not sure how to make use of them.
>>> 
>>> If building everything from scratch (the first step above) is not an
>>> option, what do I need to build? A "framework"? .dylib? .a? And than link
>>> test.o against that?
>>> 
>>> - How does Python from python.org get build? Do they use the same
>>> "./configure" and "make" as I can? Do they use any special option?
>>> 
>>> To summarize, I have Python source code and test.c and I would like to
>>> have
>>> one executable which says "Today is ....". Could someone, please, explain
>>> in layman terms, the necessary steps?
>>> 
>>> Thanks you very much in advance!
>>> 
>>> Ecir Hana
>>> _______________________________________________
>>> capi-sig mailing list
>>> capi-sig at python.org
>>> http://mail.python.org/mailman/listinfo/capi-sig
>>> 
>> 
>> 
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