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(600,400,0,0)turtle.color('yellow')turtle.bgcolor('red')turtle.fillcolor('yellow')turtle.up()turtle.goto(-250,75)turtle.down()turtle.begin_fill()for i in range(5):    turtle.forward(100)    turtle.right(144)turtle.end_fill()

 

b.画同心圆

import turtlefor i in range(5):    turtle.up()    turtle.goto(0,-20*(i+1))    turtle.down()    turtle.circle(20*(i+1))    turtle.write(10-i)

 

c.画太阳花

from turtle import *color('red','blue')begin_fill()while True:    forward(100)    left(170)    if(abs(pos()))<1:        breakend_fill()done()

 

d.画五个角星

import turtleturtle.setup(600,400,0,0)turtle.color('yellow')turtle.bgcolor('red')turtle.fillcolor('yellow')def mygoto(x,y):    turtle.up()    turtle.goto(x,y)    turtle.down()    mygoto(-250,75)turtle.begin_fill()for i in range(5):    turtle.forward(100)    turtle.right(144)turtle.end_fill()mygoto(-100,150)turtle.begin_fill()for i in range(5):    turtle.forward(50)    turtle.right(144)turtle.end_fill()mygoto(-80,80)turtle.begin_fill()for i in range(5):    turtle.forward(50)    turtle.right(144)turtle.end_fill()mygoto(-70,20)turtle.begin_fill()for i in range(5):    turtle.forward(50)    turtle.right(144)turtle.end_fill()mygoto(-80,-40)turtle.begin_fill()for i in range(5):    turtle.forward(50)    turtle.right(144)turtle.end_fill()