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Slicing an IXMLDOMNodeList


I'm using MSXML to select elements from a XML document and want
to slice off the last part of an IXMLDOMNodeList .
import win32com.client
xmldoc = win32com.client .Dispatch('msxm l.DOMDocument')
xmldoc.load('fi le.xml') True rgelem = xmldoc.selectNo des('/root/elem')
if rgelem.length > 10: .... rgelem = rgelem[-10:]
Traceback (most recent call last):
File "<interacti ve input>", line 2, in ?
File "C:\Python24\Li b\site-packages\win32c om\client\__ini t__.py",
line 454, in __getattr__
raise AttributeError, "'%s' object has no attribute '%s'" %
(repr(self), attr)
AttributeError: '<win32com.gen_ py.Microsoft XML, v4.0.IXMLDOMNod eList
instance at 0x19500888>' object has no attribute '__len__'

The IXMLDOMNodeList obviously doesn't have a '__len__' member
function (why not?).
Is there a way to make the IXMLDOMNodeList support slicing?
I've tried to give the rgelem object a __len__ member, but got
an exception from __setattr__:

File "C:\Python24\Li b\site-packages\win32c om\client\__ini t__.py",
line 462, in __setattr__
raise AttributeError, "'%s' object has no attribute '%s'" %
(repr(self), attr)
AttributeError: '<win32com.gen_ py.Microsoft XML, v4.0.IXMLDOMNod eList
instance at 0x26395112>' object has no attribute '__len__'

Anybody know how to make this work?

-- Marcel

Jul 19 '05 #1
1 1738
For future reference:

The solution to this problem is a simple one.
rgelem = list(xmldoc.sel ectNodes('/root/elem'))
returns a real list of IXMLDOMElements that can be sliced.

-- Marcel

Jul 19 '05 #2

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