python bijection

[Steven D'Aprano]

On Thu, 19 Nov 2009 15:24:46 -0800, Joshua Bronson wrote:

> I couldn't find a library providing a bijective map data structure
> (allowing for constant-time lookups by value) in the few minutes I
> looked, so I took a few more minutes to code one up:
> http://bitbucket.org/jab/toys/src/tip/bijection.py
> 
> Is this at all worth releasing? 


You just did :)


> Comments and suggestions welcome.

If I want a mapping a <-> b, I generally just create a dict {a:b, b:a}. 
What is the advantages or disadvantages of your code over the simplicity 
of the dict approach?

(That is, sell us on the features of your approach.)



-- 
Steven