Python/Tkinter button color changing

[Crawford3]

I need a bit of help here.  This program(below) works fine but I would like it if when a button was "depressed" its background color would change.  The left buttons latch a dual coil relay and the right button unlatches it.  Anyone know how to add to my program to get the left button to turn green when it is "depressed" and at the same time get the right button to change to red?  Then when the right button (unlatch) is "depressed" the colors would swap so the right button turn green and the left button would go back to red.

Here is my program:

import serial
import Tkinter

arduinoData = serial.Serial('com8', 9600)


   
           
def led1_on():
   arduinoData.write('2') #write(b'1')
   
def led1_off():
   arduinoData.write('3')

def led2_on():
   arduinoData.write('4') #write(b'2')

def led2_off():
   arduinoData.write('5')

def led3_on():
   arduinoData.write('6') #write(b'3')

def led3_off():
   arduinoData.write('7')

def led4_on():
   arduinoData.write('8') #write(b'4')

def led4_off():
   arduinoData.write('9')

def led5_on():
   arduinoData.write('A') #write(b'5')

def led5_off():
   arduinoData.write('B')

def led6_on():
   arduinoData.write('C') #write(b'6')

def led6_off():
   arduinoData.write('D')

def led7_on():
   arduinoData.write('E') #write(b'7')

def led7_off():
   arduinoData.write('F')


   
import sys
from Tkinter import*
from time import sleep

root = Tk()
frame = Frame(root)
frame.pack()

root.title("SIM SWAP SYSTEM")

num1=StringVar()

topframe = Frame(root)
topframe.pack(side = TOP)
txtDisplay = Button(frame, bg="green", fg="black", text="SIM SWAP BUTTON SYSTEM")
txtDisplay.pack(side = TOP)

button1 = Button(topframe, padx=16, bd=8, text="AIRCARD A-1 ON LINE", bg="green", fg="black", command=led1_on)
button1.pack(side = LEFT)
button2 = Button(topframe, padx=16, bd=8, text="AIRCARD A-1 UTILITY", fg="red", command=led1_off)
button2.pack(side = LEFT)


frame1 = Frame(root)
frame1.pack(side = TOP)

button1 = Button(frame1, padx=16, bd=8, text="AIRCARD A-2 ON LINE", fg="black", command=led2_on)
button1.pack(side = LEFT)
button2 = Button(frame1, padx=16, bd=8, text="AIRCARD A-2 UTILITY", fg="red", command=led2_off)
button2.pack(side = LEFT)


frame2 = Frame(root)
frame2.pack(side = TOP)

button1 = Button(frame2, padx=16, bd=8, text="AIRCARD A-3 ON LINE", fg="black", command=led3_on)
button1.pack(side = LEFT)
button2 = Button(frame2, padx=16, bd=8, text="AIRCARD A-3 UTILITY", fg="red", command=led3_off)
button2.pack(side = LEFT)


frame3 = Frame(root)
frame3.pack(side = TOP)

button1 = Button(frame3, padx=16, bd=8, text="AIRCARD A-4 ON LINE", fg="black", command=led4_on)
button1.pack(side = LEFT)
button2 = Button(frame3, padx=16, bd=8, text="AIRCARD A-4 UTILITY", fg="red", command=led4_off)
button2.pack(side = LEFT)

frame4 = Frame(root)
frame4.pack(side = TOP)

button1 = Button(frame4, padx=16, bd=8, text="AIRCARD A-5 ON LINE", fg="black", command=led5_on)
button1.pack(side = LEFT)
button2 = Button(frame4, padx=16, bd=8, text="AIRCARD A-5 UTILITY", fg="red", command=led5_off)
button2.pack(side = LEFT)


frame5 = Frame(root)
frame5.pack(side = TOP)

button1 = Button(frame5, padx=16, bd=8, text="AIRCARD A-6 ON LINE", fg="black", command=led6_on)
button1.pack(side = LEFT)
button2 = Button(frame5, padx=16, bd=8, text="AIRCARD A-6 UTILITY", fg="red", command=led6_off)
button2.pack(side = LEFT)

frame6 = Frame(root)
frame6.pack(side = TOP)

button1 = Button(frame6, padx=16, bd=8, text="AIRCARD A-7 ON LINE", fg="black", command=led7_on)
button1.pack(side = LEFT)
button2 = Button(frame6, padx=16, bd=8, text="AIRCARD A-7 UTILITY", fg="red", command=led7_off)
button2.pack(side = LEFT)


root.mainloop()