Random password generator

#!/usr/bin/env python

# Randoms - Copyright 2008 Hal Canary
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the 'Software'), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

import Tkinter
import os
import base64

def genrandint():
    'Generates a random integer between 0 and (2^32)-1'
    x = 0
    for i in range(4):
        x = (x << 8)+ord(os.urandom(1))
    return x

def randstring():
    'generate a 142-bit password consisting of A-Za-z0-9'
    return base64.b64encode(os.urandom(18),'Zz')

def genrand128int():
    'Generates a random integer between 0 and (2^128)-1'
    x = 0
    for i in range(16):
        x = (x << 8)+ord(os.urandom(1))
    return x

def generaterandletts():
    'generate a 131-bit password consisting of a-z'
    s = ''
    for i in range(28):
        x = ''
        while x == '' :
            y = ord(os.urandom(1)) # 0-255
            if y < (256//26*26):
                x = chr((y % 26) + 97)
        s = s + x
        if i%4 == 3:
            s = s + ' '
    return s

class Application(Tkinter.Frame):
    'a window that displays text'
    def __init__(self, master=None):
        Tkinter.Frame.__init__(self, master)
        self.grid()
        self.createWidgets()
        self.winfo_toplevel().resizable(width=False, height=False)

    def createWidgets(self):
        self.textBox = Tkinter.Text(self,height=4,padx=5, pady=5)
        self.textBox.grid()
        self.textBox.configure(state='disabled')
        self.quitButton = Tkinter.Button(self, text="Quit", command=self.quit)
        self.quitButton.grid()        

    def addText(self, pos, string):
        self.textBox.configure(state='normal')
        self.textBox.insert (pos, string)
        self.textBox.configure(state='disabled')        

app = Application()
app.master.title('Randomness')
app.addText('1.0', 'Integer: %d\n' % genrandint())
app.addText('2.0', 'Integer: %d\n' % genrand128int())
app.addText('3.0', 'String: %s\n' % randstring())
app.addText('4.0', 'String: %s' % generaterandletts())
app.mainloop()

Compiled version for windows