Paul Rubin <http://[EMAIL PROTECTED]> writes: > print sum([da.get(-(p[0]+q[1]), 0) for p in quads for q in quads])
The above should say: print sum(da.get(-(p[0]+q[1]), 0) for p in quads for q in quads) I had to use a listcomp instead of a genexp for testing, since I'm still using python 2.3, and I forgot to patch that before pasting to the newsgroup. But the listcomp will burn a lot of memory when the list is large. I'd be interested in the running time of the above for your large data set. Note that it still uses potentially O(n**2) space. -- http://mail.python.org/mailman/listinfo/python-list
