[Python-ideas] Message passing syntax for objects

88888 Dihedral dihedral88888 at googlemail.com
Mon Mar 18 19:24:52 CET 2013


zipher於 2013年3月19日星期二UTC+8上午1時04分36秒寫道:
> On Sun, Mar 17, 2013 at 11:46 PM, Steven D'Aprano <steve at pearwood.info> wrote:
> 
> > I am very interested in this as a concept, although I must admit I'm not
> 
> > entirely sure what you mean by it. I've read your comment on the link above,
> 
> > and subsequent emails in this thread, and I'm afraid I don't understand what
> 
> > you mean here. I feel you are assuming that your readers are already experts
> 
> > on message-passing languages (Smalltalk?). I know what *I* mean by message
> 
> > passing, but that's not necessarily what you mean by it.
> 
> 
> 
> I'm sorry, I haven't been very clear.  I'm not even an expert on
> 
> message-passing languages, but I see that it's a profound concept that
> 
> hasn't been adequately integrated into the OOP model.  In any case, I
> 
> will try to do better.  And I apologize to everyone on the list for
> 
> the prior mail spam.  A part of me is a bit giddy with the idea.
> 
> 
> 
> By message passing, I mean all the ways we communicate to objects in
> 
> the OOP environment.  Usually we "communicate" to them through
> 
> method-invokation.  But this is the wrong way, I argue, to look at the
> 
> problem.
> 
> 
> 
> With function or method syntax, you're telling the computer to
> 
> "execute something", but that is not the right concepts for OOP.  You
> 
> want the objects to interact with each other and in a high-level
> 
> language, the syntax should assist with that.
> 
> 
> 
> > By building it into the language, it would *enforce* a modular object
> 
> > style, rather than the current, very specialized and very programmer
> 
> > specific way there is now.  In fact, most people never really think in
> 
> > that paradigm, yet if the language supported/proposed such a syntax,
> 
> > programmers would start to re-arrange the whole object hierarchy in a
> 
> > new, more modular and universal way.
> 
> > [end quote]
> 
> >
> 
> > I don't understand this. In what way would message passing enforce a modular
> 
> > object style? In what way does Python not already have a modular object
> 
> > style?
> 
> 
> 
> Hopefully my paragraph clarifies that a bit.  But the key conceptual
> 
> shift is that by enforcing a syntax that moves away from invoking
> 
> methods and move to message passing between objects, you're
> 
> automatically enforcing a more modular approach.
> 
> 
> 
> Mark

Please check object pascal and objective c and erlang for 
the message-action director model of what you want.

C is too low level to be suitable for everything.



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