Vpython text as current time

Question

I'm a beginner with vpython, trying to make something like clock using text. The problem is that text actually changes but the older one stays, I have tried setting up visibility to flase, but it starts blinking. Is there proper way to do it?

from vpython import *
import time
while True:
    rate(1000)
    hour=time.localtime(time.time())[3]
    minute=time.localtime(time.time())[4]
    second=time.localtime(time.time())[5]
    textHour = str(hour)
    textHour = textHour.zfill(2)
    textMinute = str(minute)
    textMinute = textMinute.zfill(2)
    textSecond = str(second)
    textSecond = textSecond.zfill(2)
    current_time = textHour + ":" + textMinute + ":" + textSecond
    myLabel = text(text=current_time, align='center', color=color.orange, pos=vector(0,0,0))
    # myLabel.visible=False