capi-sig February 2013

capi-sig@python.org

5 participants
16 discussions

ANN: expy 0.6.5 released!
by Yingjie Lan 16 Apr '22

16 Apr '22

EXPY is an express way to extend Python! EXPY provides a way to extend python in an elegant way. For more information and a tutorial, see: http://expy.sourceforge.net/ What's new: 1. Correct treatment of __init__ method. 2. Give warnings of missing Py_INCREF on appropriate special type methods. 3. Documentation update. Cheers, Yingjie

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ANNOUNCE: PyBindGen 0.8
by Gustavo Carneiro 10 Mar '22

10 Mar '22

The other day I released PyBindGen 0.8. Main news is that it features a new experimental header file scanner based on pygccxml (i.e., it's similar to py++ in scope, if not in maturity, but does not use boost.pythonunderneath). == What == PyBindGen is a Python module that is geared to generating C/C++ code that binds a C/C++ library for Python. It does so without extensive use of either C++ templates or C pre-processor macros. It has modular handling of C/C++ types, and can be easily extended with Python plugins. The generated code is almost as clean as what a human programmer would write, and does not depend on any library or header files besides Python itself. == Where == https://launchpad.net/pybindgen/ == NEWS == - Support C++ instance attributes through getter/setter methods - Support functions as methods of C++ classes - Support the PyObject* type - Support unsigned int, C strings (char*) (from Mark Lee) - Add basic support for enum types - New experimental automatic module generator based on C/C++ header file scanner and annotations in comments, using pygccxml - Some bug fixes -- Gustavo J. A. M. Carneiro INESC Porto, Telecommunications and Multimedia Unit "The universe is always one step beyond logic." -- Frank Herbert

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C API equivalent to abc.ABCMeta.register?
by Daniel Stutzbach 02 Mar '22

02 Mar '22

I'm the author of an extension module (blist) that provides a type that fits the MutableSequence API. Is there a canonical way for me to register the type as a MutableSequence from the C API? -- Daniel Stutzbach, Ph.D. President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>

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Software Development - Application Development - Game Development
by Gary 10 Jan '22

10 Jan '22

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Re: [capi-sig] Import
by Francis Bolduc 28 Feb '13

28 Feb '13

> - I had to set path to both "lib" and to "lib/lib-dynload" - why is that? > If I remember correctly, on Windows there used to be two directories "Lib" > and "libs" (?) - one containing C extensions and the other one pure Python > modules. That has changed? In any case, why do I have to point to the > "lib-dynload" as well, why can't the interpreter recursively search the top > most "lib"? And if I wanted to include new modules, should I put them > inside "site-packages"? I don't have an answer for that. > - the docs say, "The path components should be separated by semicolons" > that is ";" - but I had to use ":" - I'm on Mac, maybe the are the docs > Windows specific? Then I think the doc is wrong. I do the following: #ifdef _WIN32 char separator = ';'; #else char separator = ':'; #endif > - to enable Python to import stdlib, is it the right way to do so with > "Py_SetPath()"? > Or are there other idioms? It is the right way. > - I read somewhere sometime that it may be possible to incude giant .zip > file, instead of all the libraries files (.py, .so) - is it true? How does > a script import from such an archive? The Python interpreter can read zip files. This is what I do myself. I zip the entire Python library and embed it inside my application. Then I extract it at run-time in a temporary directory, then I point the Python interpreter to it using Py_SetPath. > I hope you don't mind such newbie questions... Not at all. Extending and embedding and distributing Python within an application seems to be the most common use case. Once you know what to do, it is actually very simple. But it is not covered in the documentation, nor are there any examples. I only succeeded because I actually read the CPython source code. Maybe, some day, somebody will feel generous and publish an example of how to do that. Until then, this is the best place to ask questions. -- Francis Bolduc, B.Sc. CM-Labs Simulation Inc.

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Import
by ecir hana 28 Feb '13

28 Feb '13

Hello, I managed to embed Python interpreter and now I would like to include all of the standard library with the app. I built Python from source and it created a folder "lib/python3.3" with all the libraries, it seems. Before I do "Py_Initialize()" I had to do "Py_SetPath()" pointing to the application directory (there I copied the whole "lib"). It works but I have a few questions. Please: - I had to set path to both "lib" and to "lib/lib-dynload" - why is that? If I remember correctly, on Windows there used to be two directories "Lib" and "libs" (?) - one containing C extensions and the other one pure Python modules. That has changed? In any case, why do I have to point to the "lib-dynload" as well, why can't the interpreter recursively search the top most "lib"? And if I wanted to include new modules, should I put them inside "site-packages"? - the docs say, "The path components should be separated by semicolons" that is ";" - but I had to use ":" - I'm on Mac, maybe the are the docs Windows specific? - to enable Python to import stdlib, is it the right way to do so with "Py_SetPath()"? Or are there other idioms? - I read somewhere sometime that it may be possible to incude giant .zip file, instead of all the libraries files (.py, .so) - is it true? How does a script import from such an archive? I hope you don't mind such newbie questions...

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Re: [capi-sig] Qt and Python
by ecir hana 25 Feb '13

25 Feb '13

For archival purposes, here is the solution which works: http://stackoverflow.com/a/15078676/1037407

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Re: [capi-sig] Qt and Python
by Francis Bolduc 25 Feb '13

25 Feb '13

I think there is a macro defined in one the Qt headers that turns "slots" into nothing. This allows the following to work: #include <QWidget> class Something : public QWidget { Q_OBJECT public slots: void doStuff(); }; That would explain why you get this error message. You compiler sees: PyType_Slot *; Because the "slots" word disappeared. At least that's my theory. Can you include Python.h before including any Qt headers, maybe that'll solve your problem. On Mon, Feb 25, 2013 at 12:22 PM, ecir hana <ecir.hana(a)gmail.com> wrote: > Hello, > > I try to embed Python into Qt application but when I add > > #include <Python.h> > > at the top for working app, the compilation breaks with: > > ../sample/python3.3m/object.h:432:23: error: expected member name or > ';' after declaration specifiers > PyType_Slot *slots; /* terminated by slot==0. */ > ~~~~~~~~~~~ ^ > > Please, does anyone know why this happens? I'm new to all this compilation > stuff - could it be that Python defines the same names as Qt? Namely > "slots"? > > Qt uses "clang++", it that changes anything... > _______________________________________________ > capi-sig mailing list > capi-sig(a)python.org > http://mail.python.org/mailman/listinfo/capi-sig -- Francis Bolduc, B.Sc. CM-Labs Simulation Inc.

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Qt and Python
by ecir hana 25 Feb '13

25 Feb '13

Hello, I try to embed Python into Qt application but when I add #include <Python.h> at the top for working app, the compilation breaks with: ../sample/python3.3m/object.h:432:23: error: expected member name or ';' after declaration specifiers PyType_Slot *slots; /* terminated by slot==0. */ ~~~~~~~~~~~ ^ Please, does anyone know why this happens? I'm new to all this compilation stuff - could it be that Python defines the same names as Qt? Namely "slots"? Qt uses "clang++", it that changes anything...

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Re: [capi-sig] Linking problem
by M.-A. Lemburg 24 Feb '13

24 Feb '13

Ecir, please don't post such dumps to the mailing list. Use some pastebin service instead. The dump doesn't show the locations gcc is looking at (except for your current dir), so it doesn't really help. I'd suggest you get some help from a gcc/Mac OS X related forum to sort out the linking problem, as it is not Python specific. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Feb 24 2013) >>> Python Projects, Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope/Plone.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ ::::: Try our mxODBC.Connect Python Database Interface for free ! :::::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/

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capi-sig February 2013