I'm not sure about the internal "len" variable, but I usually maintain a 
separate length in something that uses a BTree by using a BTrees.Length.Length 
object:

http://svn.repoze.org/repoze.folder/trunk/repoze/folder/__init__.py

On 4/8/10 11:36 AM, Leszek Syroka wrote:
> Hi,
>
> what is the fastest way of checking the number of elements in OOBtree.
> Execution time of
>
> len( OOBtree.keys() ) and len(OOBtree)
>
> is exactly the same. For big data sets execution time is unacceptable. I
> found out that in the implementation of OOBtree (written in C) there is
> a variable called 'len', which seems to contain the length of the tree.
> Is it possible to access that variable from the python code without
> modifying the source?
>
> Best regards
> Leszek
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-- 
Chris McDonough
Agendaless Consulting, Fredericksburg VA
The repoze.bfg Web Application Framework Book: http://bfg.repoze.org/book
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