代码示例：
import turtle t = turtle.Pen() my_colors = ("red","green","yellow","black") t.width(4) t.speed(1) for i in range(10): #0 1 2 3 4 t.penup() t.goto(0,-i*10) #0, -100,-200,-300,-400 t.pendown() t.color(my_colors[i%len(my_colors)]) t.circle(15+i*10) #100,200,300, 400,, 500 turtle.done() #程序执行完，窗口仍然在结果展示：
