做系统用什么网站优化百度seo技术搜索引擎

0. 基础知识

资料来自中国mooc北京理工大学python课程

1. 蟒蛇绘制

import turtle
turtle.setup(650, 350, 200, 200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(25)
turtle.pencolor("purple")
turtle.seth(-40)
for i in range(4):turtle.circle(40, 80)turtle.circle(-40, 80)
turtle.circle(40, 80/2)
turtle.fd(40)
turtle.circle(16, 180)
turtle.fd(40 * 2/3)
turtle.done()

2. 正方形绘制

import turtle as t
t.pensize(2)
for i in range(4):t.forward(150)t.left(90)
t.done()

3. 六边形绘制

import turtle as t
t.pensize(5)
for i in range(6):t.forward(150)t.left(60)
t.done()

4. 叠边形绘制

import turtle as t
t.pensize(2)
for i in range(9):t.fd(150)t.left(80)t.done() 

5. 风轮绘制

import turtle as tt.pensize(2)
for i in range(4):t.seth(90*i)t.fd(150)t.right(90)t.circle(-150,45)t.goto(0,0)
t.done()