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别再死背语法了!Python 68个内置函数按场景整理,新手查完就能用

  • 2026-07-02 16:29:40
别再死背语法了!Python 68个内置函数按场景整理,新手查完就能用
字符串怎么转换成数字？列表如何排序？怎样同时遍历两个对象？如何判断变量类型？文件又该怎么打开？
这次把Python常见的68个内置函数按使用场景进行了分类，涵盖数据类型转换、数学运算、迭代器、字符串处理、文件读写、类型检查、面向对象和反射等内容。没必要一次全部背下来，先知道它们能解决什么问题，写代码时再回来查，反而更实用。
更适合普通人的学习方式，是从具体任务入手。先用Python完成表格合并、数据清洗、重复值处理、分类统计和文件批量整理，再逐步学习Pandas、数据可视化和自动化脚本。每学一个知识点，都马上放进实际案例里跑一遍。
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  1. CONNECT:[ UseTime:0.000555s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000821s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000336s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000618s ]
  6. SELECT * FROM `set` [ RunTime:0.000207s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000530s ]
  8. SELECT * FROM `article` WHERE `id` = 502494 LIMIT 1 [ RunTime:0.000521s ]
  9. UPDATE `article` SET `lasttime` = 1783017019 WHERE `id` = 502494 [ RunTime:0.030372s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007824s ]
  11. SELECT * FROM `article` WHERE `id` < 502494 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000536s ]
  12. SELECT * FROM `article` WHERE `id` > 502494 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001136s ]
  13. SELECT * FROM `article` WHERE `id` < 502494 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035712s ]
  14. SELECT * FROM `article` WHERE `id` < 502494 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.017262s ]
  15. SELECT * FROM `article` WHERE `id` < 502494 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.050856s ]
0.215289s