条件、循环、函数定义、字符串操作练习

1. 用循环画五角星

   turtle.begin_fill()
   for i in range(5):
       turtle.forward(100)
       turtle.right(144)
   
   turtle.end_fill

   

2.  

   用循环画同心

   from turtle import*
   
   for i in range(5):
       up()
       goto(0,-20*i)
       down()
       circle(20*i)

   

3. 用while循环画太阳花

   color('red','yellow')
   begin_fill()
   while True:
       forward(200)
       left(170)
       if abs(pos())<1:
           break
   end_fill()
   done

   

4. 用函数定义画五个五角星

   import turtle
   
   turtle.setup(600,400,0,0)
   
   turtle.color("yellow")
   turtle.bgcolor("red")
   turtle.fillcolor("yellow")
   
   def yyj_goto(x,y):
       turtle.up()
       turtle.goto(x,y)
       turtle.down()
       
   def yyj_draw(r):  
       turtle.begin_fill()
       for i in range(5):
           turtle.forward(r)
           turtle.right(144)
       turtle.end_fill()
       
   yyj_goto(-600,220)
   yyj_draw(150)
   
   yyj_goto(-400,295)
   yyj_draw(50)
   
   yyj_goto(-350,212)
   yyj_draw(30)
   
   yyj_goto(-350,145)
   yyj_draw(30)
   
   yyj_goto(-400,90)
   yyj_draw(30)

   

5. 用函数定义画钻石花瓣的太阳花

   import turtle
   
   def draw_diamond(brad):
       brad.forward(100)
       brad.right(45)
       brad.forward(100)
       brad.right(135)
   
   def draw_art():
       
       window=turtle.Screen()
       window.bgcolor("purple")
       
       brad=turtle.Turtle()
       brad.shape("turtle")
       brad.color("orange")
       brad.speed("fastest")
   
       for i in range(1,37):
           draw_diamond(brad)
           draw_diamond(brad)
           brad.left(10)
   
       brad.right(90)
       brad.forward(155)
       brad.color("green")
       brad.forward(145)
   
       window.exitonclick()