backport of 'set' to python 2.3?

[Daniel Fetchinson]

Does anyone have a pure python implementation of the builtin 'set'
object so that I could use that in python 2.3? If this would be the
case that would be really great as I wouldn't have to change my code
that runs happily on 2.5 and makes use of 'set'. Speed and performance
doesn't matter, any implementation that does exactly the same as the
builtin 'set' in 2.5 would be great.

Cheers,
Daniel
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