pwgen

#!/usr/bin/env python3

import getopt
import sys
from random import SystemRandom

cryptogen = SystemRandom()
optlist, args = getopt.getopt(sys.argv[1:], 'sy')

use_symbols = False

for o, a in optlist:
	if o == '-y':
		use_symbols = True
	elif o == '-s':
		pass
	else:
		print('Unknown option: {0}'.format(o), file=sys.stderr)
		exit(1)

if len(args) < 1:
	print('Missing required argument: length', file=sys.stderr)
	exit(2)

pool="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
if use_symbols:
	pool = pool + "=.+\"'[]()_~-!%+?" * 3

print(''.join([pool[k] for k in [cryptogen.randrange(len(pool)) for i in range(int(args[0]))]]))