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【Python学习】第7期:基础语法—运算符

  • 2026-08-21 16:10:29
【Python学习】第7期:基础语法—运算符
个人学习，仅供参考。
算数运算符
算数运算符专门用于数值类型（整数、小数））的数学运算。
运算符：+（加法）、-（减法）、*（乘法）、/（除法）、//（整除）、%（取余）、**（幂运算）。
★有小数参与，结果多为小数：只要运算中有一个数是小数（浮点数），最终结果通常会是小数。
优先级排序：**＞*、/、//、%＞+、-
赋值运算符
赋值运算符用于给变量赋值，或者基于变量当前的值修改它。
简单赋值运算符（=）：把右边的值（或运算结果）放进左边的变量里，不是数学中的“等于号”。
复合赋值运算符：先对变量做运算，再把结果重新装进这个变量，代码更简洁。
运算符
示例
等价于
+=：变量自加
i += 5
i = i + 5
-=：变量自减
i -= 5
i = i - 5
*=：变量自乘
i *= 5
i = i * 5
/=：变量自除
i /= 5
i = i / 5
//=：变量自整除
i //= 5
i = i // 5
%=：变量自取余
i %= 5
i = i % 5
**=：变量自幂运算
i **= 5
i = i ** 5
★
  1. 复合赋值必须先定义变量，不能用在未赋值的变量上；
  2. 分不清优先级时，直接用()包裹需要先算的部分，简单又不容易出错。
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  1. CONNECT:[ UseTime:0.000302s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000509s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009058s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000611s ]
  6. SELECT * FROM `set` [ RunTime:0.002507s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000610s ]
  8. SELECT * FROM `article` WHERE `id` = 507817 LIMIT 1 [ RunTime:0.020031s ]
  9. UPDATE `article` SET `lasttime` = 1787324060 WHERE `id` = 507817 [ RunTime:0.021353s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000295s ]
  11. SELECT * FROM `article` WHERE `id` < 507817 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000453s ]
  12. SELECT * FROM `article` WHERE `id` > 507817 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005399s ]
  13. SELECT * FROM `article` WHERE `id` < 507817 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002158s ]
  14. SELECT * FROM `article` WHERE `id` < 507817 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000790s ]
  15. SELECT * FROM `article` WHERE `id` < 507817 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.049185s ]
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