no __len__ attribute in NodeList or the list base?

[sndive]

i extract class object from an instance of NodeList (minicompat.py)
like so
PyObject *pclass = PyObject_GetAttrString( nodelistinsance,
"__class__");
but
PyObject_GetAttrString(pclass, "__len__")
returns NULL.

i naively added
__len__ = _get_length
to NodeList
but that ends up in endless recursion.

to explain that endless loop i have to assume __len__ is defined
in the NodeList base(list that is)
but i don't see __len__ anywhere in listobject.c!!!

this is in cpython 2.4.4

__len__ is required to be present in NodeList per this:
http://www.python.org/dev/doc/maint2...t-objects.html

[Hrvoje Niksic]

sn****@gmail.com writes:

i extract class object from an instance of NodeList (minicompat.py)
like so
PyObject *pclass = PyObject_GetAttrString( nodelistinsance,
"__class__");
but
PyObject_GetAttrString(pclass, "__len__")
returns NULL.

Are you sure about that?

>>import xml.dom.minicompat
xml.dom.minicompat.NodeList

<class 'xml.dom.minicompat.NodeList'>

>>xml.dom.minicompat.NodeList.__len__

<slot wrapper '__len__' of 'list' objects>

>>xml.dom.minicompat.NodeList()

[]

>>_.__class__

<class 'xml.dom.minicompat.NodeList'>

>>_.__len__

<slot wrapper '__len__' of 'list' objects>

to explain that endless loop i have to assume __len__ is defined
in the NodeList base(list that is)
but i don't see __len__ anywhere in listobject.c!!!

The list object has __len__:

>>list.__len__

<slot wrapper '__len__' of 'list' objects>

It just gets defined in a different way, through a C structure of
function pointers defining sequence operations. (See where
list_length is defined and used.)

[sndive]

On Nov 15, 3:09 am, Hrvoje Niksic <[e-mail]:

[e-mail] writes:

i extract class object from an instance of NodeList (minicompat.py)
like so
PyObject *pclass = PyObject_GetAttrString( nodelistinsance,
"__class__");
but
PyObject_GetAttrString(pclass, "__len__")
returns NULL.

Are you sure about that?

my apologies for the false alarm.
i was calling __len__ on Element rather than NodeList
thank you