条件、循环、函数定义 练习

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：

画五角星

import 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()

 

 

画同心圆

import turtle
turtle.speed(100)
for i in range(10):
turtle.up()
turtle.goto(0,-20*i)
turtle.down()
turtle.circle(20*(i+1))
turtle.write(10-i)

 

 

画太阳花

import turtle

turtle.speed(100)
turtle.color("pink")
turtle.fillcolor("blue")
turtle.begin_fill()
while True:
turtle.forward(200)
turtle.left(170)
if (abs(turtle.pos()))<1:
break
turtle.end_fill()

 

画五个角星

import turtle
turtle.speed(10)
def weizhi(x,y):
turtle.up()
turtle.goto(x,y)
turtle.down()

def wujiaoxing(r):
turtle.begin_fill()
for i in range(5):
turtle.forward(r)
turtle.left(-144)
turtle.end_fill()

turtle.bgcolor("red")
turtle.color("yellow","yellow")
weizhi(-300,240)

weizhi(-263,163)
wujiaoxing(100)

weizhi(-125,211)
wujiaoxing(20)

weizhi(-105,160)
wujiaoxing(20)

weizhi(-110,115)
wujiaoxing(20)

weizhi(-135,85)
wujiaoxing(20)