Special-purpose extension of Python -- new kinds of objects
David C. Fox
davidcfox at post.harvard.edu
Mon Dec 29 17:35:14 CET 2003
Robert Dodier wrote:
> Paul Rubin <http://phr.cx@NOSPAM.invalid> wrote:
>
>
>>robert_dodier at yahoo.com (Robert Dodier) writes:
>>
>>> # "dn" == "decision network", an Ephemeral construct;
>>> # this part is parsed separately from the python code
>>> dn my_example:
>>> chance X:
>>> cpd: gaussian [mean: 25, std_dev: 75]
>>> chance Y:
>>> cpd: gaussian [mean: 12, std_dev: 19]
>>> chance Z = X + Y
>>
>>I don't see what good this does. You can do the same thing with
>>ordinary Python classes.
>
>
> Thanks for your interest. I want to make it possible to experiment
> with notations that don't correspond to Python syntax. For example,
> to write "X ~ gaussian(mu,sigma2)", or to write "Y <- (X1, X2, X3)",
> say.
>
> The larger goal is to make the decision model description as
> natural as possible for people that work on decision problems.
> Development effort should focus on the decision model, which,
> in interesting problems, may be much larger and more complex
> than the ordinary Python glue code around it.
Personally, I would first write all of the code for performing
calculations in pure Python, using the usual OO notation. Then you can
always add a parser which translates the mathematical syntax into OO.
David
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