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Python零基础学习笔记(一)

  • 2026-08-18 23:12:15
Python零基础学习笔记(一)
Python是一种解释型、面向对象、动态数据类型的高级程序设计语言。解释型：没有编译环节交互式：可以在一个python提示符，直接互动执行程序面向对象：支持面向对象的风格或代码封装在对象的编程技术初学者的语言：对初级程序员来说，支持广泛的应用程序开发，从简单的文字处理到www浏览器再到游戏都可以写。

特点：

  1. 易于学习：相对较少的关键字，结构简单，明确定义的语法
  2. 易于阅读：代码定义更为清晰
  3. 易于维护：成功点在于源码相当容易维护
  4. 一个广泛的标准库：有丰富的库，跨平台兼容性好unix/windows/macintosh
  5. 互动模式：可以直接交互式，更加直观有趣
  6. 可移植：基于其开源代码的特性
  7. 可扩展：可以在python中调用c和c++语言
  8. 数据库：python提供所有主要商业数据库的接口
  9. GUI编程：支持GUI，可以创建和移植到很多系统调用
  10. 可嵌入：可以将python嵌入到c/c++程序中

缺点：

  1. 运行速度慢
  2. 代码不能加密 
  3. 移动 / 移动端支持弱
  4. 版本兼容性可能有坑，特别是python2跨到python3
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  1. CONNECT:[ UseTime:0.000688s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000771s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000273s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000320s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000647s ]
  8. SELECT * FROM `article` WHERE `id` = 511082 LIMIT 1 [ RunTime:0.017417s ]
  9. UPDATE `article` SET `lasttime` = 1787297729 WHERE `id` = 511082 [ RunTime:0.003033s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000260s ]
  11. SELECT * FROM `article` WHERE `id` < 511082 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000480s ]
  12. SELECT * FROM `article` WHERE `id` > 511082 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000504s ]
  13. SELECT * FROM `article` WHERE `id` < 511082 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001285s ]
  14. SELECT * FROM `article` WHERE `id` < 511082 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000966s ]
  15. SELECT * FROM `article` WHERE `id` < 511082 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008587s ]
0.194899s