capi-sig April 2020

capi-sig@python.org

10 participants
12 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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Mail l8st
by casperssidekick 09 Jul '21

09 Jul '21

Sent from my Verizon, Samsung Galaxy smartphone

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Should getter function return a strong reference?
by Victor Stinner 28 Apr '20

28 Apr '20

Hi, I added PyThreadState_GetFrame() and PyFrame_GetCode() functions to Python 3.9 (as part of my work to make structures opaque). These functions are basically getter to access PyThreadState.frame and PyFrameObject.f_code members. Example: struct _frame* PyThreadState_GetFrame(PyThreadState *tstate) { assert(tstate != NULL); return tstate->frame; } These functions currently return *borrowed* references. I understood that borrowed references makes it harder to write an efficient implementation of Python: https://github.com/vstinner/misc/blob/master/cpython/pep-opaque-c-api.rst#b… For example, PyPy has to convert all items of a list to PyObject when a C extension module calls PyList_GetItem(). Question: should I modify PyThreadState_GetFrame() and PyFrame_GetCode() functions to return a *strong* reference instead? Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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Re: [Python-Dev] Problem with instantiating a C extension class from another class
by Musbur 11 Apr '20

11 Apr '20

On Sat, 11 Apr 2020 01:07:24 +0000 (UTC) Daniel Scott <scottdaniel760(a)yahoo.com> wrote: > Are you calling PyType_Ready on your types? > > It is difficult to debug this without a full example. If you have a > repo with the code on github or gitlab or bitbucket, feel free to > ping me @mattip to take a look. Hello Daniel, here's a fully self-contained example. Thanks for taking a look! https://github.com/musbur/testmodule

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PEP: Modify the C API to hide implementation details
by Victor Stinner 10 Apr '20

10 Apr '20

Hi, I started a discussion on python-dev about my new PEP "Modify the C API to hide implementation details": https://mail.python.org/archives/list/python-dev@python.org/thread/HKM774XK… The PEP: https://github.com/vstinner/misc/blob/master/cpython/pep-opaque-c-api.rst#d… I advice you to participate on python-dev. If you prefer to not subscribe to python-dev, you may reply here. Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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missing `UCHAR` in `ctypes.wintypes`.
by Kingsley McDonald 10 Apr '20

10 Apr '20

hello :) (terribly sorry, i might have accidentally sent an unfinished email before this!) i'm creating a small module for interacting with SCSI devices, and i'm making use of `ctypes` to interact with the win32 API for my windows implementation. in doing so, i've had to define my own version of the SCSI_PASS_THROUGH_DIRECT<https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddscsi/ns-n…> struct using `ctypes.Structure`. when reading around earlier today, i found the `ctypes.wintypes` module and was happy to see that it could help me write my code to be more consistent with the definitions found in the win32 API. however, the `UCHAR` type appears many times in that struct i mentioned, and yet is not defined in the `ctypes.wintypes` module (in fact, it is commented out in the source with no reason given). i understand that there is probably a reason that i'm unaware of for not having a definition of `c_uchar` in the `ctypes` module. however, i don't understand why an equivalent type (such as `ctypes.c_ubyte`) hasn't been used to define `UCHAR` in the `ctypes.wintypes` module to maintain consistency with the windows API. i know that it is a bit silly to make such a big deal over an alias, but the point of these aliases is to make code look more consistent, and that's hardly the case when there's an exception to the rule! :D if this missing definition was intentional, then what is the reason behind that? or if it has been simply overlooked, then can the definition be created for the sake of consistency? i would love to make the relevant amendment myself if that is the case ^^ thanks! (and sorry again if the other email sent!) kingsley mcdonald :)

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Macros defined in CPython headers -> move to function-like macros
by Sylvain Corlay 09 Apr '20

09 Apr '20

Hi All, I hope I am not breaking any rules by posting here. I maintain a number of libraries and C++ Python extensions and one slightly annoying thing about the Python.h headers is that it includes headers defining macros such as *snprintf*. In C++, this collides with std::snprintf defined in the <cstdio>. One backward-compatible way to make these collision less likely would be to make this macro a function-style macro - so that we could prevent the macro expansion in client code by simply adding parentheses to the calls to the actual functions. (std::snprintf)(foobar) In my opinion, it would make the world a better place for C++ Python extension authors :) Best, Sylvain

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capi-sig April 2020