$ ./python -m timeit "list(x for x in range(2**30,2**30+1000))"
10000 loops, best of 3: 176 usec per loop
$ ../py3k/python -m timeit "list(x for x in range(2**30,2**30+1000))"
1000 loops, best of 3: 202 usec per loop
$ ./python -m timeit "list(x for x in range(2**37,2**37+1000))"
1000 loops, best of 3: 311 usec per loop
$ ../py3k/python -m timeit "list(x for x in range(2**37,2**37+1000))"
1000 loops, best of 3: 431 usec per loop
$ ./python -m timeit "list(x for x in range(2**63,2**63+1000))"
1000 loops, best of 3: 320 usec per loop
$ ../py3k/python -m timeit "list(x for x in range(2**63,2**63+1000))"
1000 loops, best of 3: 439 usec per loop