Suggestion for a Python Extension

[Cliff Crawford]

* Luis Cortes menulis:
| [snip] 
| I thought it might be nice to do the same with Python.  Except that
| facts are really lists in Python.  For example:
| 
| fact = [ (1,3), (2,3), (3,4)]
| ans = fact( SomeAnonymousVariable, 3 )
| 
| so that ans has:
| 
| ans = [ (1,3), (2,3) ]
| 
| I have create a couple of classes in Python to allow me to simulate
| what I want, but it would be nice if it where built-in instead,
| using my classes the last example would be:
| 
| fact = plist( [ (1,3), (2,3), (3,4)] )
| ans = fact.query( Anonymous(), 3 )
| 
| so that ans has:
| 
| ans = [ (1,3), (2,3) ]
| 
| [other examples..]

If all you want to is make the "query" method look like a function
call, then you can simply rename it to be "__call__" instead.  For
example:

>>> class test:
...     def __call__(self):
...             print "Selamat datang!"
... 
>>> a=test()
>>> a()
Selamat datang!

You would still need to create new instances of Anonymous() (or use
None, as you suggest in the source) to indicate the variables,
though.  But this isn't necessarily a bad thing; people already
used to Python will have trouble understanding why

ans = fact( SomeAnonymousVariable, 3 )

doesn't raise a NameError.

spend-less-time-on-syntax-and-more-on-semantics-<wink>-ly y'rs,

-- 
cliff crawford    -><-    http://www.people.cornell.edu/pages/cjc26/
                                                       icq 68165166
"IS I yes wardrobe yield [the] evaluation."     member of A.H.M.A.D.