Pyssword GTK

#!coding:utf-8
from random import randint
import pygtk, gtk
pygtk.require("2.0")

def gerarSenha(comp, mi, ma, nu, si):
    ch = mi * "abcdefghijklmnopqrstuvwxyz"\
        + ma * "ABCDEFGHIJKLMNOPQRSTUVWXYZ"\
        + nu * "1234567890"\
        + si * "!@#$%*(){}[]"
    pw = ""
    for _ in xrange(1, comp): pw += ch[randint(0, len(ch) - 1)]
    return pw

class MainWindow:
    def __init__(self):
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        self.window.connect("destroy", self.destroy)
        self.window.connect("delete_event", self.delete_event)
        self.window.set_title("Pyssword")

        self.vbx_grid = gtk.VBox()
        self.hbx_tambox = gtk.HBox()
        self.hbx_chkbox = gtk.HBox()
        self.hbx_senha = gtk.HBox()

        self.lbl_tamanho = gtk.Label("Tamanho: ")
        self.hsc_comprimento = gtk.HScale()
        self.hsc_comprimento.set_range(6, 32)
        self.hsc_comprimento.set_value(16)
        self.hsc_comprimento.set_value_pos(gtk.POS_RIGHT)
        self.hsc_comprimento.set_digits(0)
        self.chk_minusculo = gtk.CheckButton("Minúsculas")
        self.chk_maiusculo = gtk.CheckButton("Maiúsculas")
        self.chk_numeros = gtk.CheckButton("Números")
        self.chk_simbolos = gtk.CheckButton("Símbolos")
        self.ent_senha = gtk.Entry(max=32)
        self.ent_senha.set_editable(False)
        self.btn_gerar = gtk.Button("Gerar")
        self.btn_gerar.connect("clicked", self.btn_gerar_click)

        self.hbx_tambox.pack_start(self.lbl_tamanho, False, False, 2)
        self.lbl_tamanho.show()
        self.hbx_tambox.pack_start(self.hsc_comprimento, True, True, 2)
        self.hsc_comprimento.show()

        self.hbx_chkbox.pack_start(self.chk_minusculo, True, True, 2)
        self.chk_minusculo.show()
        self.hbx_chkbox.pack_start(self.chk_maiusculo, True, True, 2)
        self.chk_maiusculo.show()
        self.hbx_chkbox.pack_start(self.chk_numeros, True, True, 2)
        self.chk_numeros.show()
        self.hbx_chkbox.pack_start(self.chk_simbolos, True, True, 2)
        self.chk_simbolos.show()

        self.hbx_senha.pack_start(self.ent_senha, True, True, 2)
        self.ent_senha.show()
        self.hbx_senha.pack_start(self.btn_gerar, False, False, 2)
        self.btn_gerar.show()

        self.vbx_grid.pack_start(self.hbx_tambox, True, True, 2)
        self.hbx_tambox.show()
        self.vbx_grid.pack_start(self.hbx_chkbox, True, True, 2)
        self.hbx_chkbox.show()
        self.vbx_grid.pack_start(self.hbx_senha, True, True, 2)
        self.hbx_senha.show()

        self.window.add(self.vbx_grid)
        self.vbx_grid.show()
        self.window.show()

    def main(self):
        gtk.main()

    def destroy(self, widget, data=None):
        gtk.main_quit()

    def delete_event(self, widget, event, data=None):
        return False

    def btn_gerar_click(self, widget):
        self.ent_senha.set_text(gerarSenha(\
           int(self.hsc_comprimento.get_value()),\
           self.chk_minusculo.get_active(),\
           self.chk_maiusculo.get_active(),\
           self.chk_numeros.get_active(),\
           self.chk_simbolos.get_active()))

_w = MainWindow()
_w.main()