from turtle import * #控制彩虹路徑def path(pen, r, g, b): pen.penup() pen.goto(-400, -300) pen.pendown() pen.pencolor(r, g, b) pen.circle(1000, -180) pen.pensize(2) pen.right(0.05) #繪制彩虹控制顏色def Rainbow(): pen = Turtle() pen.right(110) r = 255 g = 0 b = 0 interval = 5 colormode(255) # 由紅到黃 while g < 256:  path(pen, r, g, b)  g = g + interval #由黃到綠 g = 255 while r > 0:  r = r - interval  path(pen, r, g, b) #由綠到青 r = 0 while (b < 255 ):  b = b + interval  path(pen, r, g, b) b = 255 #由青到藍 while (g > 0):  g = g - interval  path(pen, r, g, b) #由藍到紫到紅 g = 0 while r < 255:  r = r + interval  path(pen, r, g, b) #文字輸出def TextFun(): text = Turtle() text.hideturtle() text.color("red") text.penup() text.setpos(100, -100) text.pendown() text.write("Rainbow", False, align="center", font=("Script MT Bold", 80, "bold")) def main(): setup(800, 600, 0, 0) title("rainbow") tracer(False) Rainbow() TextFun() tracer(True) mainloop() if __name__ == '__main__': main()