Generate one million random, signed 32-bit integers.

genrandints.py

#!/usr/bin/env python

import os
import sys
import array
import struct


NUMRANDS = 10 ** 6          # the number of random integers we want to generate (one million)
BUFSIZE = 1000              # the number of integers we buffer internally before flushing to output

a = array.array('i')
for i in xrange(NUMRANDS):  # generate one million 32-bit integers
    # generate the integer (signed) from the OS' random source of byte strings
    randint = struct.unpack('@i', os.urandom(4))[0]
    a.append(randint)       # buffer the random integer into an array
    if len(a) >= BUFSIZE:   # flush to output buffer once we have enough
        a.tofile(sys.stdout)
        del a[:]
if a:
    a.tofile(sys.stdout)

$ ./genrandints.py > randints
$ du -b --si randints
4.0M    randints