Simple password generator created and used at my startup

simple_password_generator.py

'''

 _)   ___|   |                |   _)   _|
  | \___ \   __|   __|  _` |  __|  |  |    |   |
  |       |  |    |    (   |  |    |  __|  |   |
 _| _____/  \__| _|   \__,_| \__| _| _|   \__, |
                                          ____/

@author: jasong@apache.org

Quick password generator.
This generator is fast, *leaks, and generates *weak passwords :-)
Use to create simple strength passwords.

*  - small lengths cause leaks
** - weakest links will always be rng and hashers (speed).  

'''


import getpass
import hashlib
import os
import random
import sha
import string
import uuid

def notes(password_length, random_size):
    print("--------------------------Notes----------------------------")
    print("- Password lengths are random between 16 and 64 chars in length.")
    print("- Secondary seeding size is random between 64 and 128 chars in length.")
    print("- Simple Passwords:")
    print("    Limited char set, simple, easy to type.")
    print("- Extended:")
    print("    Several more characters allowed than simple.")
    print("- Advanced:")
    print("    Several more characters allowed than extended.")
    print("- UUID Passwords:")
    print("    (node+time) are based on host ID and current time while")
    print("    (random) are system generated random.")
    print("- Password Length: %s" % password_length)
    print("- Random data Length: %s\n" % random_size)

def showPasswords(password_data, title_text):
    # All kinds of cutting weirdness here
    _x2 = password_length/2
    _x3 = len(password_data) - _x2
    
    _sized_password = password_data[0:password_length]
    
    _first_half = password_data[0:_x2]
    _second_half = password_data[_x3:]
            
    print("%s" % title_text)
    print("Short password 1:    '%s'" % _sized_password)
    print("Short password 2:    '%s%s'" % (_first_half, _second_half))
    print(" Long password 1:    '%s'\n" % password_data)

def simplePasswords(password):
    title_text = "--------------Generated Simple Passwords-----------------"
    showPasswords(password, title_text)
    
def extendedPasswords(password):
    title_text = "-------------Generated Extended Passwords----------------"
    showPasswords(password, title_text)
    
def advancedPasswords(password):
    title_text = "-------------Generated Advanced Passwords----------------"
    showPasswords(password, title_text)
    
def uuidPasswords():
    print("\n--------Generated Random Seeded UUID Passwords-----------")
    print("UUID 1 (node+time):  '%s'" % uuid.uuid1())
    print("   UUID 2 (random):  '%s'" % uuid.uuid4())
    print("   UUID 3 (random):  '%s'" % uuid.uuid4())
    
def spacer():
    print("\n-----------------------------------------------------------")
    
def logo():
    print('''
 _)   ___|   |                |   _)   _|
  | \___ \   __|   __|  _` |  __|  |  |    |   |
  |       |  |    |    (   |  |    |  __|  |   |
 _| _____/  \__| _|   \__,_| \__| _| _|   \__, |
                                          ____/

    Quick simple strength password generator. 
''')

if __name__ == "__main__":
    
    #
    # Python os.urandom() seeds with current system time.
    # Just run it!
    #
    
    charset = [chr(i) for i in range(32,38) + range(40,127)] # advanced charset
    password_length = random.randrange(16, 64, 2) # Suck it up.
    
    random_size = random.randrange(64, 128) # If you need larger this is not for you
    
    random_data = os.urandom(random_size)
    random_data_extended = ''.join([random.choice('abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)') for i in range(random_size)]) 
    random_data_advanced = ''.join([random.choice(charset) for i in range(random_size)])
    
    inner_hash = hashlib.sha512( random_data ).hexdigest() # for good luck!
    outer_hash = hashlib.sha512( inner_hash ).hexdigest() # Oh I'm feeling lucky!

    spacer()
    logo()
    notes(password_length, random_size)
    
    simplePasswords(outer_hash)
    extendedPasswords(random_data_extended)
    advancedPasswords(random_data_advanced)
    uuidPasswords()
        
    spacer()