Mailman 3 December 2012 - capi-sig

Re: [capi-sig] Does PyObject_SetAttrString am PyArg_Parse steal an object reference?
by Hrvoje Niksic Dec. 6, 2012

Dec. 6, 2012

Robert Steckroth <robertsteckroth(a)gmail.com> writes: > In the below example, is there an extra reference to the align object > when the Py_RETURN_NONE IS hit? There is. Since PyObject_SetAttrString doesn't steal the reference count to its argument, the Py_XINCREF is unnecessary. Also, I'd use Py_INCREF there, since you already aren't entering the if-clause if align is NULL. > Also, why do I have to Py_INCREF(s_obj)? You don't. PyArg_ParseTupleAndKeywords doesn't increase … [View More]

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Does PyObject_SetAttrString am PyArg_Parse steal an object reference?
by Robert Steckroth Dec. 5, 2012

Dec. 5, 2012

In the below example, is there an extra reference to the align object when the Py_RETURN_NONE IS hit? Also, why do I have to Py_INCREF(s_obj)? If I do not, I end up with crashes. Is this a bug? PyObject *s_obj=NULL, *align=NULL; if ( ! PyArg_ParseTupleAndKeywords(args, kwds, "|OO", kwlist, &s_obj, &align) ) return NULL; if ( s_obj ) Py_XINCREF(s_obj); if ( align ) { Py_XINCREF(align); PyObject_SetAttrString(s_obj, "align", align); } Py_RETURN_NONE; } -- Bust0ut, … [View More]

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Re: [capi-sig] How to retrieve an objects method or attribute doc string?
by Hrvoje Niksic Dec. 3, 2012

Dec. 3, 2012

Robert Steckroth <robertsteckroth(a)gmail.com> writes: > I have an Python Object with a type PySurface_Type. The Object > has a method called Properties like so -> > > {"Properties", (PyCFunction)Surface_set_properties, METH_VARARGS| > METH_KEYWORDS, > "Set the surface properties as a list of integers or keywords, e.g. > set_properties(x=[int][PyList[int, ...], y=int, width=int, height=int). > Note: the Python list must be the first argument or x=PyList[… [View More]

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How to retrieve an objects method or attribute doc string?
by Robert Steckroth Dec. 2, 2012

Dec. 2, 2012

I have an Python Object with a type PySurface_Type. The Object has a method called Properties like so -> {"Properties", (PyCFunction)Surface_set_properties, METH_VARARGS| METH_KEYWORDS, "Set the surface properties as a list of integers or keywords, e.g. set_properties(x=[int][PyList[int, ...], y=int, width=int, height=int). Note: the Python list must be the first argument or x=PyList[int, ...] "}, How can I get the doc string from this method? I would like to print this in an error … [View More]

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Re: [capi-sig] A new Python module!
by Philip Semanchuk Dec. 1, 2012

Dec. 1, 2012

On Dec 1, 2012, at 3:07 PM, Robert Steckroth wrote: > Pygui is underway! It is a Python SDL Wrapper for quick application > development. I have posted a short video to Youtube for proof of concept. > The goal of PyGui is to maintain a safe framework environment for stable > and graphical application creation. It will use a macro event system > attached python callbacks for execution of code or binary/script files. > There will be zero memory concerns which will allow software … [View More]

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Fwd: What's up with PyTypeObject and functions?
by Robert Steckroth Dec. 1, 2012

Dec. 1, 2012

---------- Forwarded message ---------- From: Robert Steckroth <robertsteckroth(a)gmail.com> Date: Sat, Dec 1, 2012 at 3:18 PM Subject: Re: [capi-sig] What's up with PyTypeObject and functions? To: "M.-A. Lemburg" <mal(a)egenix.com> Thank you for the response~ I guess I should flesh out implementations before integration into the project. The error checking worked out nicely-> if ( ! PyArg_ParseTupleAndKeywords(args, kwds, "O|OO", kwlist, &s_obj, &align, &… [View More]padding_list) || !CHECK_TYPE(s_obj, &PySurface_Type) || !CHECK_TYPE(align, &PyString_Type) || !CHECK_TYPE(padding_list, &PyList_Type) ) return NULL; PyErr_Clear(); if ( ! PyArg_ParseTuple(args, "|O", &sd_obj) || (!CHECK_TYPE(sd_obj, &PySurface_Type) && !CHECK_TYPE(sd_obj, &PyDisplay_Type)) ) return NULL; PyErr_Clear(); int CHECK_TYPE(PyObject *s_obj, PyTypeObject *obj_type) { if ( ! s_obj ) return 1; PyObject *obj_str=NULL, *ptype=NULL, *pvalue=NULL, *ptraceback=NULL, *last_error=NULL, *tmp=NULL; if ( ! PyObject_TypeCheck(s_obj, obj_type) ) { obj_str = PyObject_Repr(s_obj); PyErr_Fetch(&ptype, &pvalue, &ptraceback); if ( pvalue ) { tmp = PyObject_Str(pvalue); last_error = PyString_FromFormat("%s or", PyString_AsString(tmp)); } else { last_error=PyString_FromString(""); } PyErr_Format(PyExc_TypeError, "%s [ %s ] object needs to be of type [ %s ]", PyString_AsString(last_error), PyString_AsString(obj_str), obj_type->tp_name ); Py_DECREF(obj_str); Py_DECREF(last_error); Py_XDECREF(tmp); Py_XDECREF(pvalue); Py_XDECREF(ptype); Py_XDECREF(ptraceback); return NULL; } return 1; } On Wed, Nov 28, 2012 at 4:02 AM, M.-A. Lemburg <mal(a)egenix.com> wrote: > On 28.11.2012 04:01, Robert Steckroth wrote: > > Hey Gang, why is the below snippet for error checking not working? I > wan't > > to be able to pass in different PyTypeObjects > > to the CHECK_TYPE function and check an object for that type. > > It works fine when I insert put &PyString_Type directly into > > the function like so --> > > if ( ! PyObject_TypeCheck(s_obj, &PyString_type) ) > > However, the CHECK_TYPE function will return -1 if I pass the > PyTypeObject > > in, like at the bottom of this message. > > Why does PyObject_TypeCheck not work if PyTypeObject is first passed > into a > > function? > > > > > > int CHECK_TYPE(PyObject *s_obj, PyTypeObject obj_type) { > > You need *obj_type here, since you need the pointer to the object, not > the object itself. > > > if ( ! s_obj ) > > return 1; > > > > if ( ! PyObject_TypeCheck(s_obj, &obj_type) ) { > > This needs to be obj_type. > > Your code will pass in the address of > the PyTypeObject on the stack, which will not match any of the > type objects in the Python type system. > > > PyErr_Format(PyExc_TypeError, "[ %s ] object needs to be of > > type [ %s ]\n\nUsage: %s", PyString_AsString(PyObject_Repr(s_obj)), > > obj_type.tp_name, obj_type.tp_doc ); > > This code leaks memory since the representation object is not freed. > > > return -1; } > > > > return 1; > > > > } > > > > if ( !CHECK_TYPE(align, PyString_Type) ) return NULL; > > This needs to the &PyString_Type > > -- > Marc-Andre Lemburg > eGenix.com > > Professional Python Services directly from the Source (#1, Nov 28 2012) > >>> Python Projects, Consulting and Support ... http://www.egenix.com/ > >>> mxODBC.Zope/Plone.Database.Adapter ... http://zope.egenix.com/ > >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ > ________________________________________________________________________ > > ::: Try our new mxODBC.Connect Python Database Interface for free ! :::: > > eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 > D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg > Registered at Amtsgericht Duesseldorf: HRB 46611 > http://www.egenix.com/company/contact/ > -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d -- Bust0ut, Surgemcgee: Systems Engineer --- surgemcgee.com Django_Teamplate3d [View Less]

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A new Python module!
by Robert Steckroth Dec. 1, 2012

Dec. 1, 2012

Pygui is underway! It is a Python SDL Wrapper for quick application development. I have posted a short video to Youtube for proof of concept. The goal of PyGui is to maintain a safe framework environment for stable and graphical application creation. It will use a macro event system attached python callbacks for execution of code or binary/script files. There will be zero memory concerns which will allow software developers to finish small projects on there own. It aims to be HTML like in … [View More]

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