Oh, and there is of course also a workaround without hacking the python
source code. That would be by implementing the default __hash__ of a class
to first look up wether the instance.__dict__.has_key('__hash__') and if so
then call the instance method.
But maybe you could explain why you want to override the __hash__ of
particular instances because I think we should find a way around overwriting
__hash__ for particular instances trough for example subclassing.
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