Generate a truly random password, based on atmospheric noise (random.org!)

password.py

#!/usr/bin/python

###############################################################################
#
# Script for generating a truly random password, using atmospheric noise. The
# generator uses the web service at random.org
#
# Usage:
# password.py [password length] [alphabet]
# For example: password.py 5 abcdefgh
#
###############################################################################

###############################################################################
# Default config goes here
###############################################################################

# define alphabet
alphabet = 'abcdefghijklmnopqrstuvwxyz'
alphabet += alphabet.upper()
alphabet += '0123456789'
alphabet += '@$!#%&()-/\\"\'{}[]._,;:'

# and length
password_length = 15

###############################################################################
# End config
###############################################################################

import sys
if (sys.version_info.major < 3):
    raise Exception('You must run Python 3 for this script to work')

from random import shuffle
from http.client import HTTPConnection
import re

# Try to get command line args
if 2 == len(sys.argv):
    try:
        password_length = int(sys.argv[1])
    except Exception as ex:
        alphabet = sys.argv[1]
elif 3 == len(sys.argv):
    try:
        password_length = int(sys.argv[1])
        alphabet = sys.argv[2]
    except Exception as ex:
        print("Usage: password.py [password length] [alphabet]\nFor example: password.py 5 abcdefgh")
        sys.exit()

alphabet = list(set([c for c in alphabet])) # unique chars in alphabet
if len(alphabet) < 2:
    print("The alphabet must contain at least two unique characters.")
    sys.exit()

c = HTTPConnection('www.random.org')
try:
    c.request('GET', '/integers/?num=%s&min=0&max=%s&col=1&base=10&format=html&rnd=new' % (password_length, len(alphabet)-1))
except Exception as e:
    print("Connection error:\n\t%s" % (str(e)))
    sys.exit()

data = c.getresponse().read().decode('utf-8')
m = re.search(r'<pre class="data">(.*?)</pre>', data, flags=re.S)
if m is None:
    print("Could not read data from random.org")
    sys.exit()
rnd = [int(s) for s in m.group(1).strip().splitlines()]

password = []
for i in rnd[:password_length]:
    shuffle(alphabet) # combine two layers of randomness, if one is corrupted somehow
    password.append(alphabet[i])
password = ''.join(password)
print(password)

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