[ZODB-Dev] PersistentMapping good for large numbers of objects?

[Steve Alexander]

> Someone who wants it enough is welcome to write it.  I'm not sure it comes
> up often enough to be worth the bother.  Sticking Python methods around all
> mutating BTree methods would be delicate and incur a relatively huge speed
> hit.  Methods like .update() would have to be faked via a Python loop,
> calling __setitem__ one at a time, else you'd have no hope of distinguishing
> (key, value) pairs with a new key from those replacing the value associated
> with an existing key (the former case should increase the length by 1, the
> latter is neutral).

Or, the code could ask the BTree for its __len__() after the update, and 
then store that.

I don't think I use the update method often enough for this to be an issue.

--
Steve Alexander