用python tk 写了个小程序有些问题请教大家

CODE:

#!/usr/bin/python
#filename : pythonMode.py
import wx
from Tkinter import *

import sys,os
sys.path.append(os.getcwd())
import XML_OPERA

class MainBuger:

#-----------------------------------------
#   Function
#-----------------------------------------
    def __init__ (self,master):
        self.buton_denger   = StringVar()
        self.buton_serious  = StringVar()
        self.buton_proposal = StringVar()

        self.color_denger = StringVar()
        self.color_serious = StringVar()
        self.color_proposal = StringVar()        


        self.test_userName = 'username'

           
    def mainFrame (self):

        denger_button = Button(root,textvariable = self.buton_denger,relief = GROOVE,width = 20,height = 2,bg ='red',command =self.changeText)      
        serious_button = Button(root,textvariable = self.buton_serious,relief = GROOVE,width = 20,height = 2,bg ='white',command =self.test_changeText)
        proposal_button = Button(root,textvariable = self.buton_proposal,relief = GROOVE,width = 20,height = 2,bg ='yellow',command =self.test_1_changeText)
        
            denger_button.grid(row=0,column=0)
            serious_button.grid(row=0,column=1)
            proposal_button.grid(row=0,column=2)        

    def changeText (self):
        tl = Toplevel()
        Label(tl,text = "quit").pack()
        Button(tl,text='Quit',command=root.destroy).pack()
   
        

    def test_changeText (self):
        self.buton_denger.set('6')        
        self.buton_serious.set('9')
        self.buton_proposal.set('56')
        
    def test_1_changeText (self):
        self.buton_denger.set('3')        
        self.buton_serious.set('2')
        self.buton_proposal.set('5')
            

           
               

#-----------------------------------------
#   Test
#-----------------------------------------
root = Tk()
root.overrideredirect(1)
root.geometry('550x30')
app = MainBuger(root)
app.mainFrame()
root.mainloop()