turtle库基础练习

1.画一组同切圆

import turtle
 turtle.circle(20)
 turtle.circle(40)
 turtle.circle(60)

2.画一组同心圆

r=0
 while(r<100):
turtle.up()
turtle.goto(0,-20-r)
turtle.down()
turtle.circle(20+r)
r=r+20

3.画一个五角星

import turtle
for i in range(5):
turtle.forward(50);
turtle.right(144);

4.画一个黄色实心五角星

import turtle
turtle.color('yellow')
turtle.begin_fill()
turtle.fillcolor('yellow')
for i in range(5):   
turtle.forward(50);
turtle.right(144);

turtle.end_fill()