No trees in the stdlib?

Chris Rebert clp2 at
Fri Jun 26 02:23:41 EDT 2009

On Thu, Jun 25, 2009 at 10:55 PM, João Valverde<backup95 at> wrote:
> Aahz wrote:
>> In article <mailman.2139.1245994218.8015.python-list at>,
>> Tom Reed  <tomreed05 at> wrote:
>>> Why no trees in the standard library, if not as a built in? I searched
>>> the archive but couldn't find a relevant discussion. Seems like a glaring
>>> omission considering the batteries included philosophy, particularly
>>> balanced binary search trees. No interest, no good implementations,
>>> something other reason? Seems like a good fit for the collections module.
>>> Can anyone shed some light?
>> What do you want such a tree for?  Why are dicts and the bisect module
>> inadequate?  Note that there are plenty of different tree implementations
>> available from either PyPI or the Cookbook.
> A hash table is very different to a BST.  They are both useful. The bisect
> module I'm not familiar with, I'll have to look into that, thanks.
> I have found pyavl on the web, it does the job ok, but there no
> implementations for python3 that I know of.

> Simple example usage case: Insert string into data structure in sorted order
> if it doesn't exist, else retrieve it.

That's pretty much the bisect module in a nutshell. It manipulates a
sorted list using binary search.


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