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