turtle练习

1同心圆

>>>import turtle

>>> turtle.circle(20)
>>> turtle.up()
>>> turtle.goto(0,10)
>>> turtle.goto(0,-10)
>>> turtle.circle (30)
>>> turtle.down()
>>> turtle.circle (30)
>>> turtle.up()
>>> turtle.goto(0,-20)
>>> turtle.down()
>>> turtle.circle (40)
>>> turtle.up()
>>> turtle.goto(0,-50)
>>> turtle.down()
>>> turtle.circle (40)
>>> turtle.up()

>>>turtle.down()
>>> turtle.circle (70)

2同切圆

>>>turtle.circle(40)
>>> turtle.circle(30)
>>> turtle.circle(50)
>>> turtle.shape('turtle')

3五角星

turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)

4填色五角星

>>> turtle.color('yellow')
>>> turtle.fillcolor('yellow')
>>> turtle.bgcolor('red')
>>> turtle.begin_fill()
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.right(144)
>>> turtle.forward (100)
>>> turtle.end_fill()