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Python newbie trying to embed in C++

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  Python newbie trying to embed in C++ Marwan <LarrxX@free.fr> - 2013-02-27 09:51 +0100
    Re: Python newbie trying to embed in C++ Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-27 02:26 -0700
      Re: Python newbie trying to embed in C++ Marwan Badawi <Marwan.Badawi@inria.fr> - 2013-02-28 09:11 +0100
    Re: Python newbie trying to embed in C++ Christian Gollwitzer <auriocus@gmx.de> - 2013-02-27 16:17 +0100
      Re: Python newbie trying to embed in C++ Marwan Badawi <Marwan.Badawi@inria.fr> - 2013-02-28 09:28 +0100
        Re: Python newbie trying to embed in C++ Gisle Vanem <gvanem@broadpark.no> - 2013-02-28 11:47 +0100
        Re: Python newbie trying to embed in C++ Michael Torrie <torriem@gmail.com> - 2013-02-28 11:12 -0700
    Re: Python newbie trying to embed in C++ Terry Reedy <tjreedy@udel.edu> - 2013-02-27 16:17 -0500

#40039 — Python newbie trying to embed in C++

Hello all,

I'm new to Python and just starting to learn it. For he needs of my 
project, I need to call some specific methods in Python scripts from C++.

For now, I just compiled the example in the Python documentation about 
Pure Embedding to try it out ( 
http://docs.python.org/2/extending/embedding.html#pure-embedding ).

I'm trying to test it on an extremely simple script called test.py which 
contains the following:

def testPY( value ):
    print('You input ', value )

  def Hello():
	print('Hello')


When I run the generated exe, I get errors about the functions not 
existing...

TestPython.exe test Hello
AttributeError: 'module' object has no attribute 'Hello'
Cannot find function "Hello"


My Python version is 2.7.3 because that's the version used in the module 
we need to access. And I'm using VS2010 SP1 for compiling my C++ because 
that's the version used to generate our DLLs and EXEs.

Could anyone tell me why this is happening?

And I'd appreciate it if you could give me pointers to how to easily 
call Python from C++.

Thanks in advance for your help,

Marwan

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#40041

On Wed, Feb 27, 2013 at 1:51 AM, Marwan <LarrxX@free.fr> wrote:
> When I run the generated exe, I get errors about the functions not
> existing...
>
> TestPython.exe test Hello
> AttributeError: 'module' object has no attribute 'Hello'
> Cannot find function "Hello"

"test" is the name of a module in the standard library.  My guess
would be that for some reason it's importing that module rather than
your test.py.  Make sure that test.py can be found on your sys.path,
and perhaps change the name of your module to reduce confusion.

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#40123

On 27/02/2013 10:26, Ian Kelly wrote:
> On Wed, Feb 27, 2013 at 1:51 AM, Marwan <LarrxX@free.fr> wrote:
>> When I run the generated exe, I get errors about the functions not
>> existing...
>>
>> TestPython.exe test Hello
>> AttributeError: 'module' object has no attribute 'Hello'
>> Cannot find function "Hello"
>
> "test" is the name of a module in the standard library.  My guess
> would be that for some reason it's importing that module rather than
> your test.py.  Make sure that test.py can be found on your sys.path,
> and perhaps change the name of your module to reduce confusion.
>
I just noticed that my reply went to the message sender and not to the 
newsgroup, so I'm posting again: thanks, that was it. Just renaming my 
test.py file solved the problem.

%M

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#40067

Am 27.02.13 09:51, schrieb Marwan:
> And I'd appreciate it if you could give me pointers to how to easily
> call Python from C++.

Maybe you can use boost::python?

http://www.boost.org/doc/libs/1_53_0/libs/python/doc/

Cave: I haven't used it and don't know if it is up-to-date.

	Christian

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#40124

On 27/02/2013 16:17, Christian Gollwitzer wrote:
> Am 27.02.13 09:51, schrieb Marwan:
>> And I'd appreciate it if you could give me pointers to how to easily
>> call Python from C++.
>
> Maybe you can use boost::python?
>
> http://www.boost.org/doc/libs/1_53_0/libs/python/doc/
>
> Cave: I haven't used it and don't know if it is up-to-date.
>
>      Christian
>
I just noticed that my reply went to the message sender and not to the 
newsgroup, so I'm posting again: thanks, I'll look into that.

%M

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#40127

"Marwan Badawi" <Marwan.Badawi@inria.fr> wrote:

> I just noticed that my reply went to the message sender and not to the 
> newsgroup, so I'm posting again: thanks, I'll look into that.

Yes, I often do that too; i.e. I'm subscribed to python-list@python.org
and get all messages from comp.lang.python mirrored to the ML a bit later.
I prefer the mailing-list over comp.lang.python since my NNTP server
(eternal-september.org) is rather slow and my ISP has deprecated NNTP 
long time ago. 

I saw you uses Thunderbird on Windows. I'm not sure how it by default handles
a reply-to when there is no "Reply-to" field in the header. To the address in 
"From" / "Sender" or what? 

I wish the NNTP-mailing list gateway could add a "Reply-to: <python-list@python.org>".
Since I'm getting the messages via the ML, I think it would be logical that the replies 
should by default go to the ML too.

--gv

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#40149

On 02/28/2013 03:47 AM, Gisle Vanem wrote:
> I saw you uses Thunderbird on Windows. I'm not sure how it by default handles
> a reply-to when there is no "Reply-to" field in the header. To the address in 
> "From" / "Sender" or what? 

Thunderbird has a handy, "reply to list" button that works every time no
matter what the rely-to field is set to.

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#40072

On 2/27/2013 3:51 AM, Marwan wrote:
> Hello all,
>
> I'm new to Python and just starting to learn it. For he needs of my
> project, I need to call some specific methods in Python scripts from C++.
>
> For now, I just compiled the example in the Python documentation about
> Pure Embedding to try it out (
> http://docs.python.org/2/extending/embedding.html#pure-embedding ).
>
> I'm trying to test it on an extremely simple script called test.py which
> contains the following:
>
> def testPY( value ):
>     print('You input ', value )
>
>   def Hello():
>      print('Hello')

I hope that the second def is not really indented in your original ;-).

> When I run the generated exe, I get errors about the functions not
> existing...
>
> TestPython.exe test Hello
> AttributeError: 'module' object has no attribute 'Hello'
> Cannot find function "Hello"
>
> My Python version is 2.7.3 because that's the version used in the module

The windows 2.7 on python.org is compiled with VS2008.

> we need to access. And I'm using VS2010 SP1 for compiling my C++ because
> that's the version used to generate our DLLs and EXEs.

Mixing VS compilers can be a problem, though I don't know if that is the 
case here. Even if not, it might be for your real application.

You can try compiling 2.7.3 (or later from repository) with vs2010. I 
know people have tried it. I presume it has been done. I don't know if 
there is an (unofficial) vs2010 project file in the repository.

Python.org 3.3 *is* compiled with 2010. You can also try running the 
module with that, possibly with the help of 2to3. It might not take too 
work. The author of the module might be interested in a port anyway, 
though maybe not. Or maybe extract just the part of the module you need 
for conversion.

You might start with 3.3 for your tests and initial learning to make 
sure that compiler mismatch is not a factor. When you get that to work, 
then decide what to do.

I suppose the worst alternative might be to regenerate all the needed 
dlls and exes with 2008.

-- 
Terry Jan Reedy

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