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import turtle
import random
import time

turtle.hideturtle()
turtle.penup()
turtle.goto(0, (-200))
turtle.pendown()
for i in range(10, 1, (-1)):
    turtle.colormode(255)
    a = random.randint(150, 255)
    b = random.randint(150, 255)
    c = random.randint(150, 255)
    turtle.color(a,b,c)
    turtle.write(str(i),align="center",font=("楷体",300))
    time.sleep(1)
    turtle.clear()
turtle.write("1",align="center",font=("楷体",300))
time.sleep(1)
turtle.clear()
turtle.write("Go!",align="center",font=("楷体",300))
turtle.done 

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