To inherit from an immutable class, like string or tuple, you need to use the __new__ member, not __init__. See, e.g.:
http://www.python.org/2.2.3/descrintro.html#__new__
Any volunteers out there willing to put some words about __new__ together for the main Python docs, please consider posting them on SF :)
It's currently conspicuous by its absence: http://www.python.org/dev/doc/devel/ref/customization.html
Cheers, Nick.
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Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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http://boredomandlaziness.skystorm.net
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