Mailman 3 July 2011 - capi-sig

ANN: expy 0.6.5 released!
by Yingjie Lan April 16, 2022

April 16, 2022

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 March 10, 2022

March 10, 2022

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 March 2, 2022

March 2, 2022

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 Jan. 10, 2022

Jan. 10, 2022

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Code for a Python function
by Enrico Granata July 16, 2011

July 16, 2011

Dear all, for my current task I have a Python interpreter embedded in a C++ program. There are several ways through which the user can interact with this interpreter, typing code into it, and possibly also def-fining functions. I need to be able to look into all defined functions, find one given its name and (here comes the hard part) read whatever code it currently contains. I looked into the API and there is a PyCodeObject class, but it is subject to change at any time and I do not want to start using code that might just change the next time the user upgrades Python. Is there any documented and portable-across-versions way to read the code into a Python function just given its name? Thanks for any help you'll be willing to provide on this Enrico Granata ✆ 408.974.5572 | ✉ egranata@.com

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Re: [capi-sig] Code for a Python function
by Enrico Granata July 16, 2011

July 16, 2011

On Jul 15, 2011, at 11:59 PM, Campbell Barton <ideasman42(a)gmail.com> wrote: > Hi Enrico, > Officially, I think what you want to do isn't really supported by python. > - What if the python function is loaded from a pyc with no source code? > - What if the function is defined in a string which is executed but > does not correspond to a valid __file__ you can open and inspect. > Which is exactly the scenario I envision, unfortunately. > In practice you can probably manage it if make a few assumptions. > > You can access these attributes (or their C values directly): > myfunc.__code__.co_filename > myfunc.__code__.co_firstlineno > However these are not going to help me if the function data comes from standard input instead of from a file > Personally I'd not worry about the PyCodeObject changing (though > without more details on what you do its hard to say). > > Or you could import the 'inspect' module via the C api and call its > getsource() function, however 'inspect' just makes a guess too and > isn't guaranteed to give the correct result, this at least gets around > changes in PyCodeObject but assumes a full python installation. I guess this is not viable either, still thanks a lot for your helpful hints. > _______________________________________________ > capi-sig mailing list > capi-sig(a)python.org > http://mail.python.org/mailman/listinfo/capi-sig

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How does CO_FUTURE_DIVISION compiler flag get propagated?
by Terry Westley July 3, 2011

July 3, 2011

I've built Python for the iPhone app store (not jailbreak), http://www.sabonrai.com/PythonMath/<http://www.google.com/url?sa=D&q=http://www.sabonrai.com/PythonMath/> . Like embedding Python in another app, it uses PyRun_SimpleString() to execute commands entered by the user. For evaluating expressions, it uses PyEval_EvalCode() with the dictionary from the __main__ module. My problem is that future division ("from __future__ import division") works within scripts executed by import or execfile() but not when entered interactively in the interpreter like this: >>> from __future__ import division >>> a=2/3 When you do this, you get classic (integer) division, but if you enter it as follows, you get future (float) division. >>> from __future__ import division;a=2/3 It appears that the CO_FUTURE_DIVISION compiler flag is not being retained in the interpreter so that later commands get compiled without that flag. I found a hint in comp.lang.python<http://www.google.com/url?sa=D&q=http://groups.google.com/group/comp.lang.p…>, but I don't see that PyRun_SimpleStringFlags returns the flags it uses. I guess I could watch for the user to enter the import command and set the flags on every subsequent call but seems really brittle to me. Thanks. Terry

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