At Sunday 31/12/2006 14:25, vertigo wrote:
I use nltk package - but it should not matter here.
Yes, it does. The framework should provide some form of tree traversal.
So i wanted to 'travel thru my tree' to last node which should be changed:
>>> tree6 = Tree('main', ['sub1', 'sub2'])
>>> subtree = tree6[0]
>>> subtree
'sub1'
>>> subtree = Tree('newsub',[])
>>> subtree
('newsub': )
>>> tree6
('main': 'sub1' 'sub2')
The problem is that subtree is some kind of a new variable (not pointer)
so changing it i will not alter tree6.
This, yes, is a general Python question. When you bind something to
the name "subtree", it doesn't matter what were "subtree" pointing to
before. Read http://effbot.org/zone/python-objects.htm
How to alter tree6 while
'travelling along it's nodes',
without messy referencing as tree6[0][1][0][1][1][1][0].......... ?
Without any further knowledge of the Tree objects, you could do
something like this:
def traverse_tree(tree, *ids):
result = tree
while ids:
key = ids.pop(0)
tree = tree[key]
return tree
and say: traverse_tree(tree6, 0, 1, 0, 1, 1, 1, 0) or
traverse_tree(tree6, *[0,1,0,1,1,1,0]) or traverse_tree(tree6,
*[0,1,0,1,1])[0] = another_object
--
Gabriel Genellina
Softlab SRL
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