loaderTk

import mtTkinter as Tkinter
import ttk,threading,Image,ImageTk,tkMessageBox,Queue

#Tk
MAXCOUNT = 100
IMAGE_LABEL = 'anonymous.jpg'

#messageBox
MESSAGE = "proceso terminado"
TITLE = "completado"

class changeState(threading.Thread):
 def __init__(self,value,progres,label,msg):
  threading.Thread.__init__(self)
  self._value = value
  self._progres = progres
  self._label = label
  self._msg = msg

 def run(self):
  self._progres["value"] = self._value
  self._label.set(str(self._value)+"%")
  if self._value == MAXCOUNT:self._msg()

class windowLoader(Tkinter.Tk):
 def __init__(self):
  Tkinter.Tk.__init__(self)
  self.geometry("400x400")
  lista = ("createImage","label","progresbar")
  for i in lista:
   getattr(self,i)()

 def label(self):
  self.v = Tkinter.StringVar()
  self.v.set("0%")
  label_1 = Tkinter.Label(self,image=self.image)
  label_1.pack(fill=Tkinter.BOTH,expand=True)

  label_2 = Tkinter.Label(label_1,textvariable=self.v)
  label_2.pack(side="bottom")

 def msg(self):
  msgbox = tkMessageBox.showinfo(TITLE,MESSAGE)
  self.quit()

 def change(self,value):
   state = changeState(value,self.progres,self.v,self.msg)
   state.daemon = True
   state.start()

 def createImage(self):
  openImage = Image.open(IMAGE_LABEL)
  self.image = ImageTk.PhotoImage(openImage)

 def progresbar(self):
  self.progres = ttk.Progressbar(self,length=1,maximum=MAXCOUNT)
  self.progres.pack(fill=Tkinter.X)

class threadLoader(threading.Thread):
 def __init__(self,q):
  threading.Thread.__init__(self)
  self.q = q

 def run(self):
  root = windowLoader()
  self.q.put(root)
  root.mainloop()


def loader():
 q = Queue.Queue()
 call = threadLoader(q)
 call.start()
 instance = q.get()
 return instance

Example:

import loaderTk,time

loader = loader()

for i in range(100):
 loader.change(i+1)
 time.sleep(0.1)