Mailman 3 December 2012 - 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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Re: [capi-sig] Does Py_False or Py_True need de-referencing if used in a PyObject_Compare?
by Campbell Barton Dec. 18, 2012

Dec. 18, 2012

It depends, sometimes you wont want to allow this for attribute assignment since it can be misleading. eg: foo.bar = [] On Tue, Dec 18, 2012 at 3:45 AM, Gustavo Carneiro <gjcarneiro(a)gmail.com> wrote: > You are not wrong. On the other hand, I often depend on the fact that an > empty list or dictionary is false, and true if not empty. It is quite > convenient, and I find it reasonably logical. > > On Mon, Dec 17, 2012 at 1:59 PM, Campbell Barton <ideasman42(a)gmail.com> > wrote: >> >> Take care using PyObject_IsTrue since it will accept many PyObject's >> (floats, lists, dicts etc), if you want to be strict with checking >> your input its not always so good. >> Instead you can use PyLong_AsLong() this works for True/False and any int >> type. >> >> eg: >> int param = PyLong_AsLong(value); >> if (param == -1 && PyErr_Occurred()) { >> .... error out ... >> } >> ... check the int now ... >> >> On Mon, Dec 17, 2012 at 10:23 PM, Gustavo Carneiro <gjcarneiro(a)gmail.com> >> wrote: >> > PyObject_IsTrue( >> >> >> >> -- >> - Campbell >> _______________________________________________ >> capi-sig mailing list >> capi-sig(a)python.org >> http://mail.python.org/mailman/listinfo/capi-sig > > > > > -- > Gustavo J. A. M. Carneiro > "The universe is always one step beyond logic." -- Frank Herbert -- - Campbell

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Looking for an opportunity to work with the Python CAPI
by Robert Steckroth Dec. 17, 2012

Dec. 17, 2012

I apologize if this post is a little spamy, but if there are any professionals who can point me towards a starting position in regards to this industry, I would be grateful. If not, what type of companies use the Python CAPI? -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d

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Re: [capi-sig] Does Py_False or Py_True need de-referencing if used in a PyObject_Compare?
by Gustavo Carneiro Dec. 17, 2012

Dec. 17, 2012

You are not wrong. On the other hand, I often depend on the fact that an empty list or dictionary is false, and true if not empty. It is quite convenient, and I find it reasonably logical. On Mon, Dec 17, 2012 at 1:59 PM, Campbell Barton <ideasman42(a)gmail.com>wrote: > Take care using PyObject_IsTrue since it will accept many PyObject's > (floats, lists, dicts etc), if you want to be strict with checking > your input its not always so good. > Instead you can use PyLong_AsLong() this works for True/False and any int > type. > > eg: > int param = PyLong_AsLong(value); > if (param == -1 && PyErr_Occurred()) { > .... error out ... > } > ... check the int now ... > > On Mon, Dec 17, 2012 at 10:23 PM, Gustavo Carneiro <gjcarneiro(a)gmail.com> > wrote: > > PyObject_IsTrue( > > > > -- > - Campbell > _______________________________________________ > capi-sig mailing list > capi-sig(a)python.org > http://mail.python.org/mailman/listinfo/capi-sig > -- Gustavo J. A. M. Carneiro "The universe is always one step beyond logic." -- Frank Herbert

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Re: [capi-sig] Does Py_False or Py_True need de-referencing if used in a PyObject_Compare?
by Campbell Barton Dec. 17, 2012

Dec. 17, 2012

Take care using PyObject_IsTrue since it will accept many PyObject's (floats, lists, dicts etc), if you want to be strict with checking your input its not always so good. Instead you can use PyLong_AsLong() this works for True/False and any int type. eg: int param = PyLong_AsLong(value); if (param == -1 && PyErr_Occurred()) { .... error out ... } ... check the int now ... On Mon, Dec 17, 2012 at 10:23 PM, Gustavo Carneiro <gjcarneiro(a)gmail.com> wrote: > PyObject_IsTrue( -- - Campbell

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Re: [capi-sig] Does Py_False or Py_True need de-referencing if used in a PyObject_Compare?
by Gustavo Carneiro Dec. 17, 2012

Dec. 17, 2012

On Thu, Dec 13, 2012 at 4:21 PM, Robert Steckroth <robertsteckroth(a)gmail.com > wrote: > Does the below statement have a memory leak? > > if ( PyObject_Compare(update_var, Py_False) > > Do I need to assign the Py_False first and DECREF it, or is the above > snippet ok alone. > It's safe, but note that it is more correct to use PyObject_IsTrue: there are more values that can be considered true or false, besides python's True and False objects. if (!PyObject_IsTrue(update_var)) { ... } -- Gustavo J. A. M. Carneiro "The universe is always one step beyond logic." -- Frank Herbert

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Re: [capi-sig] How do I get the Objects to clean up after a python script exits?
by Campbell Barton Dec. 16, 2012

Dec. 16, 2012

On Thu, Dec 13, 2012 at 5:45 AM, Robert Steckroth <robertsteckroth(a)gmail.com> wrote: > When I test my module in the interpreter it automatically cleans up any > created objects. This is a very nice feature > for my module and I would like to use it. How do I go about getting > my scripts to send an exit cleanup single? > > -- > Bust0ut, Surgemcgee: Systems Engineer --- > surgemcgee.com > Django_Teamplate3d > _______________________________________________ > capi-sig mailing list > capi-sig(a)python.org > http://mail.python.org/mailman/listinfo/capi-sig Heres an example of using atexit from C/Python api. (py3.x) https://svn.blender.org/svnroot/bf-blender/trunk/blender/source/blender/pyt… -- - Campbell

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