Mailman 3 August 2018 - capi-sig

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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[capi-sig]Adding an official (minimal) Cython-like tool.
by Eric Snow 09 Sep '18

09 Sep '18

Not that long ago Brett, Barry, and I were talking about how to get extension authors to move away from the C-API. Cython is the obvious choice, but it isn't an official tool nor does it necessarily make sense to make it one. Regardless, it would help all parties involved if there *were* an official tool that was part of CPython (i.e. in the repo). Cython could build on top of it and extension authors would be encouraged to use it or Cython. If such a thing makes sense, I figure we would follow the pattern set by asyncio (relative to twisted). -eric

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[capi-sig]Re: New pythoncapi GitHub organization and creation of a test suite for the Python C API
by Jeroen Demeyer 03 Sep '18

03 Sep '18

On 2018-08-31 10:31, Victor Stinner wrote: > I don't wante to write unit tests with Cython, cffi or anything else, > because I really need very thin control on everything. You don't need "very thin control on *everything*". You need very thin control on specific parts of the testsuite. And that's the nice thing about Cython: you can easily shift the amount of control that you take. You can write the usual unittest classes and test_FOO methods where you don't care much about control but write fine-tuned C code (either using Cython syntax or C syntax) where you do want control. Of course you may have other reasons to not want Cython...

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[capi-sig]New pythoncapi GitHub organization and creation of a test suite for the Python C API
by Victor Stinner 03 Sep '18

03 Sep '18

Hi, To be able to work on a fork of CPython, I decided to create a new GitHub organization: https://github.com/pythoncapi/ I didn't want to work on my personal fork of CPython (vstinner/cpython). The organization has a single member: me, but I invited Eric Snow, Barry Warsaw and Pablo Galindo. Tell me if you want to join! I moved my documentation there, the source of https://pythoncapi.readthedocs.io/ website: https://github.com/pythoncapi/pythoncapi/ And I just forked CPython: https://github.com/pythoncapi/cpython I will experiment to implement the new C API in this fork, to not bother the upstream CPython. I started with a very simple change, replace PyTuple_GET_ITEM() macro with a function call. I also started to write unit tests: https://github.com/pythoncapi/cpython/blob/pythoncapi/capi/tests/test_tuple… I quickly experimented to write my own C unit test framework, but I'm not really satisfied of the "verbose" API. I'm looking at googletest and Check, does someone have an experience with a C unit test framework? I don't wante to write unit tests with Cython, cffi or anything else, because I really need very thin control on everything. Victor

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[capi-sig]Re: Adding an official (minimal) Cython-like tool.
by Jeroen Demeyer 04 Aug '18

04 Aug '18

On 2018-07-31 18:42, Brett Cannon wrote: > Yes, what Eric is suggesting is a baseline tool like Cython be added to > Python itself so it becomes the minimum, common tool that we point all > extension authors to. You didn't answer Victor's "stupid question": we can already point extension authors to Cython. Why do we need a new tool which will very likely have less features than the already-existing Cython? > then we will have to provide an FFI compiler for people to use in at least > the simple cases. Cython is *not* an FFI tool. It can be used for FFI but that's just one of its many use cases.

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[capi-sig]Re: Adding an official (minimal) Cython-like tool.
by Jeroen Demeyer 04 Aug '18

04 Aug '18

On 2018-08-04 00:23, Barry Warsaw wrote: > I think if we were to go down this path, we’d need something that comes with CPython by default. Why?

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[capi-sig]Re: Let's change to C API!
by Jeroen Demeyer 04 Aug '18

04 Aug '18

On 2018-07-31 14:52, Victor Stinner wrote: > For C extensions which use (1), what's the benefit of moving to (2)? Source compatibility between Python releases: the source code compiles and works the same way on all Python versions (above a certain minimum version).

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