条件、循环、函数定义 练习

• 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

import turtle
turtle.shape(‘turtle‘)
turtle.color(‘yellow‘)
turtle.bgcolor(‘red‘)
turtle.fillcolor(‘yellow‘)
turtle.begin_fill()
for i in range(5):
turtle.forward(100)
turtle.right(144)
turtle.end_fill()

2.画同心圆

import turtle
turtle.shape(‘turtle‘)
turtle.begin_fill()
for i in range(5):
turtle.up()
turtle.goto(0,-30*(i+1))
turtle.down()
turtle.circle(30*(i+1))
turtle.end_fill()

3.画太阳花

import turtle
turtle.shape(‘turtle‘)
turtle.bgcolor(‘pink‘)
turtle.color(‘red‘)
turtle.fillcolor(‘yellow‘)
turtle.begin_fill()
while True:
turtle.forward(200)
turtle.left(170)
if(abs(turtle.pos()))<1:
break
turtle.end_fill()

4.画五个角星

import turtle

turtle.shape(‘turtle‘)
turtle.setup(600,400,0,0)
turtle.color(‘yellow‘)
turtle.bgcolor(‘red‘)
turtle.fillcolor(‘yellow‘)

def cxtgoto(x,y):
turtle.up()
turtle.goto(x,y)
turtle.down()

cxtgoto(-250,75)
turtle.begin_fill()
for i in range(5):
turtle.forward(100)
turtle.right(144)
turtle.end_fill()

cxtgoto(-130,150)

turtle.begin_fill()
for i in range(5):
turtle.forward(40)
turtle.right(144)
turtle.end_fill()

cxtgoto(-80,100)
turtle.begin_fill()
for i in range(5):
turtle.forward(40)
turtle.right(144)
turtle.end_fill()

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

cxtgoto(-130,-20)
turtle.begin_fill()
for i in range(5):
turtle.forward(40)
turtle.right(144)
turtle.end_fill()

条件、循环、函数定义 练习

原文：http://www.cnblogs.com/qingting/p/7508584.html