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Python学习记录5——数据类型的转换和运算符

  • 2026-08-18 23:11:29
Python学习记录5——数据类型的转换和运算符
一、数据类型的转换
1、在特定场景下，数据类型可以相互转换。如字符串可以转数字，数字可以转字符串。eg：input（）语句结果默认为字符串，若需要数据需要转换。
2.常见的转换语句：
（1）int(x)         将x转换为一个整数。浮点数转换为整数时会丢失精度。
（2）float(x)      将x转换为一个浮点数。
（3）str(x)         将x转换为一个字符串。
type()                用于检查数据类型
注：①任何类型，都可以通过str()转换为字符串；②字符串内必须是真的数字，才可以将字符串转换为数字。
练习：
二、运算符（共七种）
1、常见的算术运算符
（1）加（+）：两数相加a+b
（2）减（-）：两数相减a-b
（3）乘（*）：两数相乘a*b
（4）除（/）：两数相除a/b
（5）取整除（//）：返回除法运算后的整数部分，忽略小数点后的所有位数。
（6）取模（取余）（%）：返回除法的余数a%b。
（7）取幂（次方）（**）：来算一个数的几次方。
练习：
2、复合赋值运算符
（1）=（赋值运算符）：把=右边的结果赋值给左边的量。
（2）+=（加法赋值运算符）：a+=1相当于a=a+1
（3）-=（减法赋值运算符）：a-=1相当于a=a-1
（4）*=（乘法赋值运算符）：a*=1相当于a=a*1
（5）/=（除法赋值运算符）：a/=相当于a=a/1
（6）//=（整除法赋值运算符）：a//=1相当于a=a//1
（7）%=（模赋值运算符）：a%=1相当于a=a%1
（8）**=（幂赋值运算符）：a**=1相当于a=a**1
练习：
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  137. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  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:0.000973s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001359s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002665s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003782s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001630s ]
  6. SELECT * FROM `set` [ RunTime:0.003840s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002319s ]
  8. SELECT * FROM `article` WHERE `id` = 507684 LIMIT 1 [ RunTime:0.026992s ]
  9. UPDATE `article` SET `lasttime` = 1787316868 WHERE `id` = 507684 [ RunTime:0.003711s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005043s ]
  11. SELECT * FROM `article` WHERE `id` < 507684 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001502s ]
  12. SELECT * FROM `article` WHERE `id` > 507684 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.031566s ]
  13. SELECT * FROM `article` WHERE `id` < 507684 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.069881s ]
  14. SELECT * FROM `article` WHERE `id` < 507684 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.027016s ]
  15. SELECT * FROM `article` WHERE `id` < 507684 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.030973s ]
0.403719s