A BTree does not keep track of it's length. See BTrees.Length.Length:

http://apidoc.zope.org/++apidoc++/Code/BTrees/Length/Length/index.html

Laurence

On 8 April 2010 16:36, Leszek Syroka <leszek.marek.syr...@cern.ch> 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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