条件、循环、函数定义 练习

对前面的代码进行优化，用for,while,if,def实现：

1. 画五角星

   import turtle
   turtle.setup(600,400)
   for i in range(5):
       turtle.forward(150)
       turtle.left(144)
   done

    

   

    

2. 画同心圆

   import turtle
   turtle.setup(600,400)
   turtle.speed(10)
   
   for i in range(10):
       turtle.up()
       turtle.goto(0,-20*(i+1))
       turtle.down()
       turtle.circle(20*(1+i))
   done

   

    

    

3. 画太阳花

   import turtle
   turtle.setup(600,400)
   turtle.speed(10)
   turtle.bgcolor('purple')
   turtle.color('red','yellow')
   turtle.begin_fill()
   while True:
       turtle.forward(250)
       turtle.left(170)
       if(abs(turtle.pos()))<1:
           break
   turtle.end_fill()
   done

   

    

4. 画五个角星

   import turtle
   turtle.speed(10)
   turtle.setup(288,192)
   turtle.shape('turtle')
   turtle.setup(800,533)
   turtle.bgcolor('red')
   turtle.color('yellow')
   turtle.fillcolor('yellow')
   
   def my_goto(x,y):
       turtle.up()
       turtle.goto(x,y)
       turtle.down()
   
   def my_star(a):
       turtle.begin_fill()
       for i in range(5):
           turtle.forward(a)
           turtle.right(144)
       turtle.end_fill()
   
   def my_littlestar(b):
       turtle.begin_fill()
       for i in range(5):
           turtle.right(72)
           turtle.forward(b)
           turtle.right(144)
       turtle.end_fill()
    
   my_goto(-360,180)
   my_star(60)
   my_goto(-280,240)
   my_littlestar(20)
   my_goto(-240,200)
   my_littlestar(20)
   my_goto(-240,160)
   my_littlestar(20)
   my_goto(-280,120)
   my_littlestar(20)
   
   turtle.hideturtle()

   

    e:画◇花瓣的太阳花

   import turtle
   turtle.speed(10)
   turtle.bgcolor('black')
   turtle.fillcolor('white')
   
   turtle.begin_fill()
   for i in range(36):      
       for j in range(2):        
           turtle.forward(100)
           turtle.right(45)
           turtle.forward(100)
           turtle.right(135)      
       turtle.right(10)
   turtle.right(90)
   turtle.forward(400)
   turtle.end_fill()
   
   done