On Thu, Apr 07, 2022 at 11:52:31AM -0000, malmiteria wrote:
> I believe my gobelin exemple is a fair case of MI since we can
> definitely say halfbreed *is a* corruptedgobelin *and a* proudgobelin.
That is the most common relationship modelled by inheritance.
> In such a case with multiple *is a* there's multiple strategies to
> blend in the multiple *is a*.
And super does that correctly.
Except that you prefer to use a different design that is not well-
modelled by inheritance, but is well-modelled by delegation. And then
for some reason, you insist on using super.
> Another strat is to say that some attributes / behaviors of one parent
> override the over, like dominant genes.
Don't be fooled by the name, inheritance in programming languages does
not model DNA. It is a simple model useful for programming.
> Today's MRO implicitely overrides all method from the second parent
> with method from the first parent.
Right, because it models **cooperative inheritance**, not DNA. A method
in one class overrides that in classes later in the MRO unless it
cooperatively passes the call on to the next class in the MRO.
> Essentially, the first parent (in declaration order) is dominant on
> all attributes. This isn't very subtle, as we could want some
> attribute of each parent to be dominant, while others to be recessive.
This is all very hypothetical. You could want Intercal's COMEFROM
statement too, but why would you?
MI is complicated enough without intentionally trying to make it
arbitrarily more complicated, when instead you can just use composition
or delegation instead.
You want to write this:
super(ProudGobelin, self).method()
But you can already do that, using less typing, and get exactly the same
effect:
ProudGobelin.method(self)
That does everything you want, and saves you seven characters. Less
typing, more efficient, works today in standard Python, no special
imports needed or changes to the interpreter or language. All you need
to do is **don't use super** for things that don't need super.
The only reason you won't use it is that you insist on using the
screwdriver of super() to hammer in the nails of delegation.
--
Steve
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