python for循環實現turtle 滿天都是小星

import turtle

turtle.pencolor("yellow")
turtle.pensize("5")
turtle.fillcolor("red")

a = 0
b = 0
for i in range(30):
    a += 1
    if i % 6 == 0:
        a = 0
        b += 1
    turtle.penup()
    turtle.goto(-300+100*a,300-100*b)
    turtle.pendown()

    turtle.begin_fill()
    for _ in range(5):
        turtle.forward(100)
        turtle.right(144)
    turtle.end_fill()

turtle.penup()
turtle.goto(-150,0)
turtle.pendown()
turtle.color("violet")
turtle.write("滿天都是小星星",font=("楷體",40,"bold"))

turtle.mainloop()

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