capi-sig February 2020

capi-sig@python.org

13 participants
8 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 10 Jul '21

10 Jul '21

Sent from my Verizon, Samsung Galaxy smartphone

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Trying to embed Py3.8 w frozen modules -- correct place to seek help?
by Katie Lucas 07 Mar '20

07 Mar '20

Hello. I'm trying to embed a Py3.8 interpreter into a C++ application to use as the "glue" for all the other components. We've come across some complexities -- revolving around the use of frozen modules and multiple interpreter states -- and I'm wondering if this is the correct list to seek some assistance? We can get a single interpreter running. We can add our stream objects and capture the output, we can load our modules (giving the API access) into it and generally everything seems fairly happy in single interp mode. When we try and run a Py_NewInterpreter() to get us more interps to get encapsulation between multiple scripts, it fails to launch (fails to get filesystem's codec). The problem seems to be that the frozen modules added to the launched interpreter are not cached after use. So the cloned interpreter fails to start (it wants either an encoder search path which is null for no filesystem OR to have the encodings module available). The modules don't seem to be being cached because when the import runs them with PyEval_EvalCode, they return nothing. I suspect this is something I've missed about how to configure the original interpreter, but documentation & use-examples for the new split-phase initialisation are rather hard to find. Cheers for any help you can provide, Katie

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Update on the limited C API
by Victor Stinner 28 Feb '20

28 Feb '20

Hi, I pushed a few changes to hide even more implementation details from the limited C API of CPython. See "Changes in the limited C API" documentation at: https://docs.python.org/dev/whatsnew/3.9.html#build-and-c-api-changes I'm interesting to get your feedback on such changes. I know that the PyQt project uses the limited C API. Apart from that, I don't know other C extension using it. One idea would be to consume it directly in CPython for a bunch of C extensions. It would help to check if the API is complete enough for a non-trivial extension. It should also help to detect issues earlier. Currently, CPython only uses the limited C API the "xxlimited" which is basically a test module only written to show how this API can be used. By the way, I just opened "Make PyObject an opaque structure in the limited C API" issue: https://bugs.python.org/issue39573 It's a follow-up on Neil Schemenauer's proof-of-concept of tagged pointer in CPython that he wrote in September 2018. Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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"xxx's subscription disabled on capi-sig"
by Victor Stinner 17 Feb '20

17 Feb '20

Hi, As one of the capi-sig list owners, I got many emails like: "xxxx <xxx@xxx>'s subscription has been disabled on capi-sig(a)python.org due to their bounce score exceeding the mailing list's bounce_score_threshold." I guess that many people subscribed long time ago when the list was still run by Mailman 2 and Mailman 2 didn't have this feature. The list migrated to Mailman 3 something like 1 year ago. I guess that Mailman 3 started to disable many subscriptions because it has stricter default policy on bouncing. Anyway, if you don't get new emails (like this one), check your subscription at: https://mail.python.org/mailman3/lists/capi-sig.python.org/ Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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capi-sig February 2020