On 3/26/13 1:44 PM, Jason Grout wrote:
On 3/26/13 1:38 PM, Jason Grout wrote:
On 3/26/13 12:35 PM, kcrisman wrote:
On Tuesday, March 26, 2013 12:14:02 PM UTC-4, jason wrote:
On 3/26/13 11:06 AM, kcrisman wrote:
> This is just a question mostly for Jason and William, who have
both been
> reimplementing interacts.
>
> Could the following syntax be (fruitfully) made to work?
>
> @interact
> def _(x,y=2,1):
> x,y=x*x+3*y*y,x*y+y*x
> html("$%s^2-3\cdot%s^2=%s$"%(x,y,x^2-3*y^2))
>
> It seems very "Pythonic" in some ways but I assume that Python
functions
> in general don't accept this, so probably it's a bad idea to try
to hack
> it in. But I thought I'd put it out there and risk the
ridicule :)
>
What are you thinking that the result should look like and how it
should
behave?
The same as
@interact
def _(x=2,y=1):
Oh, I see. You're wanting something like def f((x,y)=(1,2)) to work,
right? I'd cast my vote with sticking with python (which does not allow
that syntax).
I take that back. I found the PEP I had been searching for. That
syntax *is* allowed in Python 2:
http://www.python.org/dev/peps/pep-3113/
sage: def f((x,y)=(1,2)):
.....: print x,y
.....:
sage: f((1,2))
1 2
but it is removed in Python 3.
In fact, both sage notebook and sage cell don't handle this correctly:
http://sagecell.sagemath.org/?q=4716a2dd-040e-428b-82f9-b799fe98cd9c
(and a similar error in the sage notebook).
I do suppose we could fix this, but the issue would most likely go away
whenever we migrate to python 3.
Thanks,
Jason
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