Prolog-style unification?

Simon Burton simonb at webone.com.au
Sun Jun 8 04:28:17 CEST 2003


On Sat, 07 Jun 2003 14:38:40 -0600, junk wrote:

> Hi Robert,
> 
> I am working on a Master's Thesis currently where this issue is of 
> concern.  I would also like to know if there is such a module.
> 
> In the mean time, I have written my own module which does a pretty good 
> job of simulating Prolog style calls.  Here is what my syntax looks like 
> right now:
> 
> import logic
> Father = logic.Fact()
> Father("Seth","Alex")
> Father("James","Seth")
> X = logic.LogicalVariable()
> Y = logic.LgocialVariable()

too verbose for me. howbout just Var ?

> while Father(X,Y):
>     print X, Y

Know about iterators?

i'd like to see
for x,y in Father():
  print x, y

are you trying too hard to adhere to prolog syntax maybe?

> 
> print "--------------"
> 
> Grandfather = logic.Fact()
> Grandfather(Grandfather.Grandfather, Grandfather.Grandson) (
>     Father(Grandfather.Grandfather, Grandfather.Son)
>     Father(Grandfather.Son, Grandfather.Grandson))

does this use __getattr__ hooks? otherwise where does the attributes of
Grandfather come from?

> 
> while Grandfather(X,Y):
>     print X,Y
> 
> 
> The output of this is:
> 
> James Seth
> Seth Alex
> ------------------
> James Alex
> 
> I'm still tracking down bugs all the time, but it's getting pretty good.
> 
> Would you PLEASE let me know what you think?
> 
> -- Seth James Nielson


Excellent; i'd like to see more logic for python stuff.
Please post your code!

Simon Burton.







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