Perfect hashing for Py

[bearophileHUGS at lycos.com]

Following links from this thread:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/179e1a45485ab36a#

I have found this perfect hash (minimal too) implementation:
http://burtleburtle.net/bob/hash/perfect.html

I have already translated part of it to D, and it seems to work well
enough. As discussed in the PyConDue, I think this may be used in
frozenset (and frozendict) to build a (minimal too?) perfect hash on
the fly, to allow (hopefully) faster retrieval of items that don't
change.
That code is C and I think it's public domain, so if experiments show
it gives enough speed up, it may be added to CPython 2.6/3.

Bye,
bearophile