条件、循环、函数定义 练习

1.注意标准库的两种导入与使用方式，建议大家采用<库名>.<函数名>的方式。

2.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.color('yellow')
   
   def my_goto(x,y):
       turtle.up()
       turtle.goto(x,y)
       turtle.down()
   
   def my_drwa5(r):
   
       turtle.begin_fill()
       for i in range(5):
           turtle.forward(r)
           turtle.left(144)
           
   my_goto(10,10)
   my_drwa5(150)
   turtle.end_fill()
   turtle.hideturtle()
   tuertle.done()

   

2. 画同心圆

   import turtle
   for i in range(6):
       turtle.up()
       turtle.goto(0,-20*(i+1))
       turtle.down()
       turtle.circle(20*(i+1))
   turtle.hideturtle()
   turtle.done()

   

3. 画太阳花

   import turtle
   turtle.color('red','pink')
   turtle.begin_fill()
   while True:
       turtle.forward(200)
       turtle.right(170)
       if(abs(turtle.pos()))<1:
           break
       
   turtle.end_fill()
   turtle.hideturtle()
   turtle.done()
       

   

4. 画五个五角星

   import turtle
   turtle.bgcolor('red')
   turtle.color('yellow')
   
   def my_goto(x,y):
       turtle.up()
       turtle.goto(x,y)
       turtle.down()
   
   def my_drwa5(r):
   
       turtle.begin_fill()
       for i in range(5):
           turtle.forward(r)
           turtle.left(144)
           
   my_goto(-750,235)
   my_drwa5(150)
   turtle.end_fill()
   
   turtle.begin_fill()
   my_goto(-550,360)
   my_drwa5(50)
   turtle.end_fill()
   
   turtle.begin_fill()
   my_goto(-500,300)
   my_drwa5(50)
   turtle.end_fill()
   
   turtle.begin_fill()
   my_goto(-490,230)
   my_drwa5(50)
   turtle.end_fill()
   
   turtle.begin_fill()
   my_goto(-550,170)
   my_drwa5(50)
   turtle.end_fill()
   
   turtle.hideturtle()
   turtle.done()

   

5. 画◇花瓣的太阳花

   import turtle
   turtle.speed(10)
   turtle.fillcolor('yellow')
   turtle.bgcolor('pink')
   turtle.begin_fill()
   for i in range(1,37):
       turtle.forward(100)
       turtle.right(45)
       turtle.forward(100)
       turtle.right(135)
       turtle.forward(100)
       turtle.right(45)
       turtle.forward(100)
       turtle.right(135)
       turtle.left(10)
   turtle.end_fill()
   turtle.color('purple')
   turtle.begin_fill()    
   turtle.right(90)
   turtle.forward(300)
   turtle.end_fill()