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
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