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04 Python3 数据类型转换+注释+运算符

  • 2026-07-02 02:02:10
04 Python3 数据类型转换+注释+运算符
基于AI的流行，所有主流的AI框架只认Python，那么学习Python这个语言就势在必行了，TensorFlow（谷歌）、Pytorch（Meta）、Hugging Face（大模型）、Scikit-learn（传统机器学习）python都是第一语言没有之一
Python3数据类型转换分为两大类，隐式类型转换和显式类型转换
隐式类型转换中，python自动将一种数据类型转换为另一种数据类型，不需要认为的去干预
显示类型转换中，用户将对象的数据类型转换为所需的数据类型，比如int(),float(),str()等预定义函数来执行显示类型转换
Python3注释不会影响程序的执行，但是会更易于代码的阅读和理解，主要分为单行注释和多行注释
单行注释用# 开头，# 符号后面的所有文本都被视为注释，不会被解释器执行
多行注释用三个单引号'''或者三个双引号"""，注意多行注释不能嵌套
python中常见运算符有这几类，这几类中我们把常见的学会即可

  • 算术运算符

  • 比较（关系）运算符

  • 赋值运算符

  • 逻辑运算符

  • 位运算符

  • 成员运算符

  • 身份运算符

  • 运算符优先级

算数运算符，用来进行数据运算相关的操作

比较运算符 用来比较两个对象或者数据的大小等
赋值运算符 将变量进行操作后进行赋值
位运算符 按照位进行预算
逻辑运算符 进行逻辑运算的相关操作
成员运算符 判断是否包含一系列的成员
身份运算符 判断两个对象的存储单元是否相同
运算符优先级，这个可以忽略  感觉这个不是很常用
今天先讲到这里吧  先消化消化
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  138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000569s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000951s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000310s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000440s ]
  6. SELECT * FROM `set` [ RunTime:0.000233s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000542s ]
  8. SELECT * FROM `article` WHERE `id` = 497743 LIMIT 1 [ RunTime:0.000364s ]
  9. UPDATE `article` SET `lasttime` = 1783011542 WHERE `id` = 497743 [ RunTime:0.007597s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 497743 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000378s ]
  12. SELECT * FROM `article` WHERE `id` > 497743 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011246s ]
  13. SELECT * FROM `article` WHERE `id` < 497743 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000923s ]
  14. SELECT * FROM `article` WHERE `id` < 497743 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002558s ]
  15. SELECT * FROM `article` WHERE `id` < 497743 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.029188s ]
0.122684s