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

a、画五角星

import turtleturtle.setup(600,400)for i in range(5):    turtle.forward(100)    turtle.right(144)

b、画同心圆

import turtlefor i in range(5):    turtle.up()    turtle.goto(0,-30*(i+1))    turtle.down()    turtle.circle(30*(i+1))

c、画太阳花

import turtle turtle.color('red','blue')turtle.begin_fill()while True:    turtle.forward(360)    turtle.left(150)    if(abs(turtle.pos()))<1:       breakturtle.end_fill()done

d、画五个角星

import turtleturtle.setup(700,500,0,0)turtle.color('yellow')turtle.bgcolor('red')turtle.fillcolor('yellow')def my_goto(x,y):    turtle.up()    turtle.goto(x,y)    turtle.down()def my_wujiaoxing(r):    turtle.begin_fill()    for i in range(5):        turtle.forward(r)        turtle.right(144)    turtle.end_fill()my_goto(-335,160)my_wujiaoxing(100)my_goto(-200,240)my_wujiaoxing(50)my_goto(-150,180)my_wujiaoxing(50)my_goto(-150,100)my_wujiaoxing(50)my_goto(-200,30)my_wujiaoxing(50)