syntax question

From: AF (AnthonyF_at_Blarg.NET)
Date: 04/05/04

Date: 5 Apr 2004 14:23:17 -0700

If I have a list of touples:

l = [(x1, y1), (x2, y2), ...]

Is there a 1 line way to extract and get the sum of each x and y
column. I can do it this way with 2 lines of code and iterating
through the list twice:

sumx = sum([x for x, y in l])
sumy = sum([y for x, y in l])

Is there a 1 liner way to get the sums of both x and y and only
iterate thru the list once?

Also, is there a way to extract a list of x's and a list of y's from
the touple list? 1 line of course.