Red Black Tree implementation?

[duncan smith]

On 02/05/13 00:11, Dan Stromberg wrote:
>
> What's the best Red Black Tree implementation for Python with an
> opensource license?
>
> I started out looking at
> http://newcenturycomputers.net/projects/rbtree.html because it was
> pretty high in Google and had the operators I wanted, but it gets very
> slow at about half a million elements.  I've been discussing this with a
> C programmer who believes that Red Black Trees should perform very
> similarly to an AVL tree, but that's not at all what I'm getting with
> the newcenturycomputers implementation.
>
> I'd prefer something that looks like a dictionary, runs on 2.x and 3.x,
> and passes pylint, but if that's not yet available I might make it so.
>
> This is part of a comparison of Python tree types I did a while back...
> I've been thinking that I've given Red Black Trees short shrift by using
> a poor implementation.  The comparison so far is at
> http://stromberg.dnsalias.org/~strombrg/python-tree-and-heap-comparison/
>
> Thanks!
>
>


I have an implementation that you can try out. It's not based on any 
other implementation, so my bugs will be independent of any bugs in the 
code you're currently using. It looks more like a set - add, remove, 
discard. Not tried on Python 3 or run through pylint. I just tried 
adding a million items to a tree, and it takes about 25% longer to add 
items at the end compared to those at the beginning. Timing removals 
uncovered a bug. So if you want the code I'll fix the bug and send it 
(to your gmail e-mail address?). Cheers.

Duncan