class EntryForm():
    '''Форма ввода'''
    def __init__(self, root = None, pict=''):
        self.tl = Toplevel()
        self.tl.title("Tst")
        self._entry_val = ''                    
        self.frame = Frame(self.tl)
        self.frame.pack()
        self.label = Label(self.tl, text="Ввод:", fg="red")
        self.label.pack(side=TOP) 
        self.entry = Entry(self.tl)
        self.entry.focus_set()
        self.entry.pack(side = TOP)
        self.entry.bind("<Return>", self.onEnter)
           
    def onEnter(self, event):
        '''Процедура вызываемая на 
           нажатие Enter в поле entry формы'''
        self._entry_val = self.entry.get()
        if self._entry_val == '':
            self._entry_val = 'empty'
        self.tl.destroy()
        return self._entry_val
    
    def getEntryVal(self):
        '''Возвращает символы введенные 
           в поле entry формы'''
        return self._entry_val
    
if __name__ == '__main__':
           
    class App(Tk):
        def __init__(self):
            Tk.__init__(self)
            self.btn = Button(self, text = "Нажми меня!")
            self.btn.bind("<ButtonPress-1>", self.start)
            self.btn.pack(side = TOP)

        def visio(self):
            self.tl = EntryForm()
                    
        def prepareThr(self):
            print "prepareThr() begin"
            for i in xrange(10):
                self.visio()
                txt = ''
                while 1:
                    txt = self.tl.getEntryVal()
                    if txt != '':
                        break
                    time.sleep(0.1)
                print txt
                #del(self.tl)
            print "prepareThr() end"
                        
        def start(self, event):
            print "start() begin"
            thr = threading.Thread(target = self.prepareThr, name = "thr").start()
            print "start() end"            
            
    t = App()
    t.mainloop()