On Wed, 29 Mar 2000, Guido van Rossum wrote: > Let's not confuse subtypes and subclasses. One of the things implicit > in the discussion on types-sig is that not every subclass is a > subtype! Yes, this violates something we all learned from C++ -- but > it's a great insight. No time to explain it more, but for me, Peter's > subclassing UserString for MutableString to borrow implementation is > fine. Oh, I agree with this. An earlier argument which got snipped in the discussion is why it's a bad idea to borrow implementation (a totally different argument) -- Moshe Zadka <mzadka@geocities.com>. http://www.oreilly.com/news/prescod_0300.html http://www.linux.org.il -- we put the penguin in .com
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