练习不同颜色画圆

#!/usr/bin/env python

#-*- coding:utf-8 -*-

import turtle

t=turtle.Pen()

my_colors=("red","green","yellow","black")

t.width(4)
t.speed(1)
for i in range(20):
    t.penup()#抬笔
    t.goto(0,-i*10)
    t.pendown()#下笔
    t.color(my_colors[i%len(my_colors)])
    t.circle(15+i*10)


turtle.done()#程序执行完窗口任然在

输出