genpass.py

#!/usr/bin/python
import sys, random

if len(sys.argv) < 2:
    print("Please supply number of letters to generate")
    sys.exit(1)
try:
    letters_to_generate = int(sys.argv[1])
except:
    print("Argument must be a number")
    sys.exit(1)

letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890!@#$%^&*(-_=+)"
print ''.join([random.choice(letters) for letter in range(letters_to_generate)])