Try to do this inside an externmal method. You are not allowed to import such module into PythonScript since PythonScripts are executed within a sandbox with tons of restrictions. -aj --On Freitag, 25. April 2003 9:58 Uhr -0500 Glen Ecklund <Glen@TheGeoGroup.com> wrote:

Hello. I am have trouble accessing an OOBTree. I have found several clues that indicate several different syntaxes, none of which work. Here are some of the things I've tried:

===============================================================

from BTrees.OOBTree import OOBTree

tree = OOBTree() tree['a'] = 'AAA'

Gets:

Error Type: TypeError Error Value: object does not support item or slice assignment

===============================================================

from BTrees.OOBTree import OOBTree

tree = OOBTree() tree.insert['a'] = 'AAA'

Gets:

Error Type: Unauthorized Error Value: You are not allowed to access insert in this context

===============================================================

from BTrees.OOBTree import OOBTree

tree = OOBTree() insert(tree, 'a', 'AAA')

Gets:

Error Type: NameError Error Value: global name 'insert' is not defined

===============================================================

from BTrees.OOBTree import OOBTree

tree = OOBTree() OOBTree.insert(tree, 'a', 'AAA')

Gets:

Error Type: Unauthorized Error Value: You are not allowed to access insert in this context

===============================================================

Also, I need to be able to access elements of the tree. Do I use has_key to check for existence of an element? I haven't been able to get it working either. Do I use Val = tree['a'] to retrieve the value?

Third, how do I make my object persistent? I know that there is a Persistent package, but I don't know how to make my tree persistent.

Thank you very much, Glen

_______________________________________________ Zope maillist - Zope@zope.org http://mail.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope-dev )

Glen Ecklund wrote:

===============================================================

from BTrees.OOBTree import OOBTree

tree = OOBTree() tree['a'] = 'AAA'

Gets:

Error Type: TypeError Error Value: object does not support item or slice assignment

Not sure why that doesn't work, actually. OIBTrees sure allow you to use tree['a'] syntax, so so should OOBTrees, and I don't see why you shouldnt be able to assign 'AAA' to it. Hang on....<testing>...the above code works for me, so maybe there is some weirdness in accessing these from a Python script? I don't see why though. Maybe you need to specially admit access to __getitem__? I'm no good at the Python script security...

tree.insert['a'] = 'AAA'

Insert is a method, not a dictionary.

insert(tree, 'a', 'AAA')

Well:

Error Value: global name 'insert' is not defined

Explains that very well.

from BTrees.OOBTree import OOBTree

tree = OOBTree() OOBTree.insert(tree, 'a', 'AAA')

Insert is not a class method, but an object method, you should call it on the object.

Do I use Val = tree['a'] to retrieve the value?

Yes.

Third, how do I make my object persistent?

The Zope BTrees are persistent, you only need to assign the BTree to an attribute and you are done.