1.画一组同切圆
>>> import turtle
>>> turtle.circle(60)
>>> turtle.circle(50)
2.画一组同心圆
>>>import turtle
>>> turtle.circle(120)
>>> turtle.shape('turtle')
>>> turtle.up()
>>> turtle.goto(0,30)
>>> turtle.down()
>>> turtle.circle(90)
3.画一个五角星
>>> turtle.reset()
>>> import turtle
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
4.画一个黄色实心五角星
>>> turtle.reset()
>>> import turtle
>>> turtle.color('yellow')
>>> turtle.fillcolor('yellow')
>>> turtle.begin_fill()
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.left(144)
>>> turtle.forward(100)
>>> turtle.end_fill()
