Something like this may be fast enough: >>> from itertools import izip >>> xpartition = lambda seq, n=2: izip(*(iter(seq),) * n) >>> xprimes = (x for x in xrange(2, 100) if all(x % i for i in xrange(2, x))) >>> list(xpartition(xprimes)) [(2, 3), (5, 7), (11, 13), (17, 19), (23, 29), (31, 37), (41, 43), (47, 53), (59, 61), (67, 71), (73, 79), (83, 89)]
Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
