On Fri, 12 Oct 2007, Joel B. Mohler wrote:
>
> On Friday 12 October 2007 13:36, Mike Hansen wrote:
>> If you're doing a dictionary anyway, doesn't it make more sense to use
>> **kwargs? For example,
>>
>> sage: P.<x,y>=ZZ[]
>> sage: f=x*y^2+x*y+y+x+1
>> sage: f.coefficient(y=2)
>> x
>> sage: f.coefficient(y=1)
>> x + 1
>> sage: f.coefficient(x=1, y=2)
>> 1
>>
>> It takes a little bit to get used to the semantics of it, but the
>> syntax is much more natural / Pythonic.
>
> Hmm, possibly. kwargs feels scary to me with variables since the 'x' in the
> kwargs parameter list is a totally different 'x' than the one in P.gen(0).
> They just happened to be named the same in some different scope. I think
> that allowing both methods might be ok.
... I don't understand what you mean by this. When you construct a polynomial
ring, each variable gets a name, and that name is (AFAIK) immutable.
If an argument doesn't correspond to an entry in R.variable_names(), then an
exception should be raised.
>
> Another more concrete reason is that I want to do something like this:
>
> P=PolynomialRing(ZZ,'x',n)
> d={}
> d[P.gen(1)] = 1
> d[P.gen(2)] = 2
> poly.coefficient(d)
>
> That is, I want to fill out my dictionary very dynamically. I suppose there
> is probably a way to do this with kwargs, but it feels like a reach into some
> dark corner syntactically.
>
> --
> Joel
>
> >
>
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