Python:

import time
import os

def xoa_man_hinh():
    os.system('cls' if os.name == 'nt' else 'clear')
while True:
    xoa_man_hinh()
    print("Den do")
    time.sleep(10)  
    xoa_man_hinh()
    print("Den xanh")
    time.sleep(10) 
#Haclac