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python底层逻辑

  • 2026-06-30 04:47:45
python底层逻辑

python底层逻辑

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一次纯粹的 hacking
Python 的作者,Guido von Rossum,荷兰人。1982 年,Guido 从阿姆斯特丹大学获得了数学和计算机硕士学位。尽管,他算得上是一位数学家,但他更加享受计算机带来的乐趣,热衷于做任何和编程相关的活儿。
80 年代,掀起了个人电脑浪潮,但受限于个人电脑配置低,所有的编译器的核心是做优化,以便让程序能够运行。在那个时代,程序员恨不得用手榨取计算机每一寸的能力。有人甚至认为 C 语言的指针是在浪费内存,至于动态类型,内存自动管理,面向对象…… 别想了,那会让你的电脑陷入瘫痪。
而这种编程方式让 Guido 感到苦恼。Guido 知道如何用 C 语言写出一个功能,但整个编写过程需要耗费大量的时间。
不过,他还有另一个选择 shell。shell 可以像胶水一样,将 UNIX 下的许多功能连接在一起。UNIX 的管理员们常常用 shell 去写一些简单的脚本,以进行一些系统维护的工作,比如定期备份、文件系统管理等等。然而,shell 的本质是调用命令,并不能全面的调动计算机的功能。
Guido 希望有一种语言,这种语言能够像 C 语言那样,能够全面调用计算机的功能接口,又可以像 shell 那样轻松的编程。
ABC 语言让 Guido 看到希望。ABC 是由荷兰的数学和计算机研究所开发的,Guido 在该研究所工作,并参与到 ABC 语言的开发。ABC 语言是一个致力于为初学者设计编程环境的长达 10 年的研究项目,与当时的大部分语言不同,ABC 语言的目标是 “让用户感觉更好”。
比如下面是一段来自 Wikipedia 的 ABC 程序,这个程序用于统计文本中出现的词的总数:
HOW TO RETURN words document: PUT {} IN collection FOR line IN document: FOR word IN split line: IF word not.in collection: INSERT word IN collection RETURN collection
HOW TO 用于定义一个函数。一个 Python 程序员应该很容易理解这段程序。ABC 语言使用冒号和缩进来表示程序块。行尾没有分号。for 和 if 结构中也没有括号 ()。赋值采用的是 PUT,而不是更常见的等号。这些改动让 ABC 程序读起来像一段文字。
#计算机 #编程 #程序员 #学习 #Python #Python学习

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  1. CONNECT:[ UseTime:0.000658s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000858s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000263s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000584s ]
  6. SELECT * FROM `set` [ RunTime:0.000247s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000767s ]
  8. SELECT * FROM `article` WHERE `id` = 492460 LIMIT 1 [ RunTime:0.000471s ]
  9. UPDATE `article` SET `lasttime` = 1783067988 WHERE `id` = 492460 [ RunTime:0.022238s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000376s ]
  11. SELECT * FROM `article` WHERE `id` < 492460 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000576s ]
  12. SELECT * FROM `article` WHERE `id` > 492460 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000538s ]
  13. SELECT * FROM `article` WHERE `id` < 492460 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000747s ]
  14. SELECT * FROM `article` WHERE `id` < 492460 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000986s ]
  15. SELECT * FROM `article` WHERE `id` < 492460 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000977s ]
0.098995s