Control scroll bar in python with arduino

import time, sys, serial
toolbar_width = 70
ser = serial.Serial('COM3', 9600)
# setup toolbar
sys.stdout.write("[%s]" % (" " * toolbar_width))
sys.stdout.flush()
sys.stdout.write("\b" * (toolbar_width+1)) # return to start of line, after '['
for i in xrange(toolbar_width):
    info = ser.readline()
    time.sleep(int(info)/1000)
    # update the bar
    sys.stdout.write("*")
    sys.stdout.flush()
sys.stdout.write("]\nFinished!")