条件循环函数定义 练习

Posted 2020-10-06 钟嘉丽

• 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。
• 对前面的代码进行优化，用for,while,if,def实现：
  1. 画五角星
  2. import turtle turtle.forward(200)turtle.left(144)for i in range(5):       turtle.forward(200)        turtle.left(144)

      

  3. 画同心圆

     import turtle
     def concentric(i):
         turtle.up()
         turtle.goto(0,-20*(i+1))
         turtle.down()
         turtle.circle(20*(i+1))

     for i in range(5):
         concentric(i)

      

  4.  

  5. 画太阳花

  import turtle

• turtle.color("yellow","red")

• turtle.begin_fill()

• while True:   

•     turtle.forward(200)    

•     turtle.left(170)    

•      if (abs(turtle.pos()))<1:        

•      break

• turtle.end_fill()

• done()

• 

   

   

  1. 画五个角星

     import turtle
     turtle.color(\'yellow\')
     turtle.bgcolor(\'red\')
     turtle.fillcolor(\'yellow\')
     def mygoto(x,y):
         turtle.up()
         turtle.goto(x,y)
         turtle.down()
     mygoto(-230,130)
     turtle.begin_fill()
     for i in range(5):
         turtle.forward(100)
         turtle.right(144)
     turtle.end_fill()

     mygoto(-110,200)
     turtle.begin_fill()
     for i in range(5):
         turtle.forward(40)
         turtle.left(144)
     turtle.end_fill()

     mygoto(-75,150)
     turtle.begin_fill()
     for i in range(5):
         turtle.forward(40)
         turtle.left(144)
     turtle.end_fill()

     mygoto(-65,90)
     turtle.begin_fill()
     for i in range(5):
         turtle.forward(40)
         turtle.left(144)
     turtle.end_fill()

     mygoto(-90,30)
     turtle.begin_fill()
     for i in range(5):
         turtle.forward(40)
         turtle.left(144)
     turtle.end_fill()