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python编程第2课《神奇的线》

  • 2026-04-23 22:52:06
python编程第2课《神奇的线》
      前一课学习了什么是编程？为什么要学习python编程之后，我们正式进入了第2课《神奇的线》。首先，我们用海龟画笔画一个《三角形》，代码实现见下图：
接着问：如下这些多边形怎么画出来呢？
再分析多边形的内角和与外角和的关系。
得出结论：
比如：画五角星
这是如何算出左转的角度呢？如图：
再进一步思考：
进而再看其它多角星，怎么画出来呢？
再思考：
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  1. CONNECT:[ UseTime:0.000667s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000924s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000258s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000506s ]
  6. SELECT * FROM `set` [ RunTime:0.000221s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000655s ]
  8. SELECT * FROM `article` WHERE `id` = 486515 LIMIT 1 [ RunTime:0.000474s ]
  9. UPDATE `article` SET `lasttime` = 1777036657 WHERE `id` = 486515 [ RunTime:0.005439s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000286s ]
  11. SELECT * FROM `article` WHERE `id` < 486515 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 486515 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000400s ]
  13. SELECT * FROM `article` WHERE `id` < 486515 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000994s ]
  14. SELECT * FROM `article` WHERE `id` < 486515 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006539s ]
  15. SELECT * FROM `article` WHERE `id` < 486515 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008317s ]
0.107031s