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Python对数据进行分段运算

  • 2026-04-21 07:32:58
Python对数据进行分段运算
又是一个网上很经典的题，运费分段计算：表中列出了目的地和结算重量：
根据单价对照表进行运费计算：
解这道题的关键在于对结算重量进行分段拆分：如187.2KG，首重为1,[1-50]阶段重量为49，[50-100]阶段重量为50，[100-300]阶段重量为：87.2，其他阶段为0，拆分后的结果如下：
然后匹配单价对照表中的目的地与分段价格相乘再求和，结果如下：
拆解为以上步骤后，对应用Pyhon写相应功能：
1、读取目标数据并设置首重区间
2、对重量进行分段拆分（核心运算）
3、匹配单价对照表计算运费并写入新文件：
看下运行效果
运行的结果和网友写的公式运行一致，唯一不同的是没考虑小数点位数，这道题同样没有直接函数的可以调用，所以需要自己写核心算法，从效率上来说，如果数据只有几百行，可以用高阶公式，但如果数据超过一万行，果断用Python，直接出结果。
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  1. CONNECT:[ UseTime:0.000684s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000814s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000257s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000559s ]
  8. SELECT * FROM `article` WHERE `id` = 484324 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1776749784 WHERE `id` = 484324 [ RunTime:0.000815s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000232s ]
  11. SELECT * FROM `article` WHERE `id` < 484324 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000425s ]
  12. SELECT * FROM `article` WHERE `id` > 484324 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001005s ]
  13. SELECT * FROM `article` WHERE `id` < 484324 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000691s ]
  14. SELECT * FROM `article` WHERE `id` < 484324 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000876s ]
  15. SELECT * FROM `article` WHERE `id` < 484324 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000860s ]
0.076262s