turtle.ontimer(fun, t=0)

# import packages
import turtle
import random
  
# global colors
col = ['red', 'yellow', 'green', 'blue',
       'white', 'black', 'orange', 'pink']
  
# method to call on timer
def fxn():
    global col
    ind = random.randint(0, 7)
  
    # set background color of the
    # turtle screen randomly
    sc.bgcolor(col[ind])
  
  
# set screen
sc = turtle.Screen()
sc.setup(400, 300)
  
# loop for timer
for i in range(10):
    turtle.ontimer(fxn, t=400*(i+1))