On Sun, 10 Jun 2007 03:58:44 -0700, bullockbefriending bard wrote:
> i have a large collection of python objects, each of which contains an
> integer 6-tuple as part of its data payload. what i need to be able to
> do is select only those objects which meet a simple tuple element
> wildcard matching criterion. e.g. given the following python objects:
>
> object A includes tuple (1,2,3,4,5,6)
> object B includes tuple (1,4,4,4,11,1)
> object C includes tuple (1,3,9,1,1,1)
>
> all tuples are unique. for what it's worth, the values in each field
> are independent of the other fields and range from 1 to 14. although
> 'large', my collection is sparse cf. the 14^6 possible tuples.
>
> i want to search on *one only* tuple field/value. if my search
> criterion is (*,*,*,4,*,*), then i want to find object A and object B.
> if (1,*,*,*,*,*), i want to find objects A, B, and C, etc. i will only
> ever specify an integer match for one tuple field.
>
> i can think of some naive approaches, but is there an elegant way to
> do this?
Instead of passing a wild-card tuple like (*,*,*,4,*,*) simply pass the
integer you want to match and the position you want to match it in.
As a generator:
def matcher(list_of_objects, what, where):
for obj in list_of_objects:
if obj.data[where] == what:
yield obj
As a generator expression:
(obj for obj in list_of_objects if obj.data[what] == where)
--
Steven.
--
http://mail.python.org/mailman/listinfo/python-list
