duck typing assert

Andriy Kornatskyy andriy.kornatskyy at live.com
Fri Nov 9 18:55:03 CET 2012


duck(Foo).match(IFoo, <kwargs>)
duck(Foo).like(IFoo, <kwargs>)

Hm... function name in most cases is read as verb... this may cause confusion:
duck => synonyms => immerse, dip

Thanks.

Andriy Kornatskyy

----------------------------------------
> From: ramit.prasad at jpmorgan.com
> To: andriy.kornatskyy at live.com; python-list at python.org
> Subject: RE: duck typing assert
> Date: Fri, 9 Nov 2012 17:37:29 +0000
>
> Andriy Kornatskyy wrote:
> >
> > Thank you for all comments.
> >
> > > It makes very good sense to say:
> > >
> > > duckmatch(IFoo).compare(Foo)
> >
> > Since we do duck match of IFoo... but there is no `duck match`, there is `duck test`. I believe instead of
> > `compare` is more readable with `equals`. Than it is more from mathematics - precise answer... that you can not
> > guarantee at all in dynamic programming language. So it false to use such wording to reflect this check. We can
> > only make an assumption that one looks like the other (similar)... with some limitation of cause...
> > understanding what is `duck test`.
> >
> > http://en.wikipedia.org/wiki/Duck_test
> >
> > The intent is to make such language `construct` so it reads as English sentence that make sense, and not
> > mandatory `pythonic` way (readability counts, java smokes aside).
> >
> > is_similar(Foo).to(IFoo) # <= but we lost `duck test` sense here?
> >
> > Words `looks` and `like` are coming from duck test and point also direction:
> >
> > # 1
> > looks(Foo).like(IFoo, notice=['__len__'], ignore_funcs=['foo'], ignore_argspec['bar'])
> >
> > English sentence equivalent: if functions in Foo looks like one in IFoo than, probably, IFoo can be replaced
> > with Foo; notice to check __len__, it is safe to ignore function `foo` and arguments passed to `bar`.
> >
> > # 2
> > looks(Foo, notice=['__len__'], ignore_funcs=['foo'], ignore_argspec['bar']).like(IFoo)
> >
> > English sentence equivalent: while looking at Foo notice to check `__len__`, it is safe to ignore function `foo`
> > and arguments passed to `bar`, than probably it like IFoo.
>
> What about?
>
> duck(Foo).equivalent_to(IFoo, <kwargs>)
> duck(Foo).matches(IFoo, <kwargs>)
>
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