turtle库基础练习

1. 画一组同切圆 

   >>> import turtle
   >>> turtle.circle(10)
   >>> turtle.circle(20)
   >>> turtle.circle(30)
   >>> turtle.circle(40)

2. 画一组同心圆

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

3. 画一个五角星

   >>> import turtle
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)

4. 画一个黄色实心五角星

   >>> import turtle
   >>> turtle.reset()
   >>> turtle.fillcolor('yellow')
   >>> turtle.color('yellow')
   >>> turtle.begin_fill()
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)
   >>> turtle.right(144)
   >>> turtle.forward(50)