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import turtle turtle.bgpic("window.gif") pen = turtle.Pen() pen.pensize(5) pen.pencolor("red") #定义画三角形函数 def triangle(side,color):   for i in range(3):     pen.color(color)     pen.forward(side)     pen.left(120)      #定义画正方形函数 def square(side,color):   for i in range(4):     pen.color(color)     pen.forward(side)     pen.left(90) def S(r,color):   pen.color(color)   pen.circle(r,360)     for i in range(4):   S(50,"red")     S(60,"red")   square(50,"black")   square(120,"black")   pen.left(90) #调用函数