simple script for generating random numbers in python

rnd.py

#!/usr/bin/python
import sys
import getopt
n = 1
src = "urandom"

def Usage():
  print """a simple script to generate random numbers. syntax is as follows:
""" + sys.argv[0]+ """ [options] <number of random numbers to print> 
There are only 2 options:

-r, --random	 use the "more" random but blocking /dev/random (quite slow)
-h, --help	 prints this help
""",
# Get options
try:
	optlist, args = getopt.getopt(sys.argv[1:], 'hr', ['help','random'])
except KeyboardInterrupt:
	sys.exit("KeyboardInterrupt caught.")
except getopt.GetoptError:
	print "Invalid arguments!"
	Usage()
	sys.exit(1)

#print optlist
#print args
for opt, arg in optlist:
	if opt == "-h" or opt == "--help":
		Usage()
		sys.exit(0);
	elif opt == "-r" or opt == "--random":
		src="random"
if(len(args) > 0):
        try:
	        n = int(args[0])
        except ValueError:
        	print "Please enter a valid numerical argument."
                sys.exit(1)

f = open("/dev/"+src, "rb")
for i in xrange(0,n):
	print str(ord(f.read(1)))+' ',