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   源码介绍

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import turtle

window = turtle.Screen()
bg = turtle.Turtle()
bg.color("green","black")
bg.left(90)
bg.forward(100)
bg.right(90)
bg.color("black","black")
bg.begin_fill()
bg.circle(10)
bg.end_fill()
#bg.circle(10)

for i in range(1,24):
    if bg.color() == ("red","black"):
         bg.color("orange","black")
    elif bg.color() == ("red","black"):
         bg.colot("yellow","black")
    else:
         bg.color("red","black")
    bg.left(15)
    bg.forward(50)
    bg.left(157)
    bg.forward(50)
bg.hideturtle()
window.exitonclick()