--- Ron Adam <rrr@ronadam.com> wrote:
However, I do think there could be very useful uses for a standard sorting structure of some sort. That's the sorting as in mail sorters, or category sorters, that produce several streams of output instead of just one.
Would that be called a de-comprehension?
Here is some category-sorting code, FWIW, where every employee, Fred or not, gets a 50% raise, and employees are partitioned according to their Fredness. It doesn't use a general iterator, so maybe I'm missing your point. def partitions(lst): dct = {} for k, value in lst: dct.setdefault(k, []).append(value) return dct.items() def is_fred(emp): return 'Fred' in emp[0] emps = [ ('Fred Smith', 50), ('Fred Jones', 40), ('Joe Blow', 30), ] def pay_increase(salary): return salary * 0.5 emp_groups = partitions([(is_fred(emp), (emp[0], pay_increase(emp[1]))) for emp in emps]) for fredness, emps in emp_groups: print print 'is Fred?', fredness for name, pay_increase in emps: print name, pay_increase ---- is Fred? False Joe Blow 15.0 is Fred? True Fred Smith 25.0 Fred Jones 20.0 ____________________________________________________________________________________ Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center. http://autos.yahoo.com/green_center/