Hi,
You asked:
What do you mean by "structural subtyping"?
In short if an object looks like another object it's a
structural subtype. Given a type T which consists of things
with four legs, then dogs and tables are subtypes of T
because they have four legs. So if I can see the internal
structure of an object I can subytype this way.
For OO-encaspulated languages the subtyping is limited to
the public methods. Given a type C which consists of things
which respond to the command 'draw', both an Artist and a
Cowboy are subtyes of C. Note the semantic dissonance 
I'm playing with the first kind, ie subtyping of composite,
un-named, un-encapsulated objects (which may have been read
in as input).
The wikipedia definition htt
p://en.wikipedia.org/wiki/Structural_subtyping is here.
Cheers,
Bill
-----Original Message-----
From: melbourne-pug-bounces+birchb=anz.com python.org
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Message: 1
Date: Sun, 19 Mar 2006 22:26:48 +1100 (EST)
From: <brucedecoy-postyahoo.com.au>
Subject: Re: [melbourne-pug] New list member
To: melbourne-pugpython.org
Message-ID: <20060319112648.47943.qmailweb60219.mail.yahoo.com>
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Bill Birch wrote:
> Hi,
>
> Having just joined this mailing list, I thought I'd
> introduce myself. I'm currently using Python 2.4 at
> work to convert images and auto-generate test cases
> for a Java application. It has been a very pleasant
> experience using Python. Although I keep forgetting
> the :
You get used to it after a little while:
> Outside work I'm particularly interested
> in "structural subtyping" and have started
a modest
> project to add some of that to Python.
What do you mean by "structural subtyping"?
> Looking forward to meeting some local Pythonistas!
We haven't had a get together for quite a while.
Anyone interested in meeting to share some
experiences?
>
> Bill Birch
Bruce
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