Nick Coghlan <[EMAIL PROTECTED]> wrote: [quoting from the Reference Manual] > If a class defines mutable objects and implements a __cmp__() > or __eq__() method, it should not implement __hash__(), since the dictionary > implementation requires that a key's hash value is immutable (if the object's > hash value changes, it will be in the wrong hash bucket)."
I know that's what it says, but I don't think it's good advice. All that is really required is that __hash__() always returns the same value over the lifetime of the object, and that objects which __cmp__() the same always return the same hash value. That's it. That's all a dictionary cares about. Making the object immutable is certainly the easiest way to achieve that goal, but it's not the only way. -- http://mail.python.org/mailman/listinfo/python-list
