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用 Python 搞定数据清洗

  • 2026-02-07 18:57:20
用 Python 搞定数据清洗

用 Python 搞定数据清洗

⭐⭐Python 数据清洗速查指南，基于 Pandas 库的高频数据预处理方法
核心内容梳理为五大模块：
1️⃣ 缺失值 & 重复值处理：统计缺失值、删除 / 填充缺失数据，清理重复值，批量替换指定数值。
2️⃣ 数据结构快速洞察：查看数据前 N 行、核验字段数据类型、生成数据统计概况。
3️⃣ 列维度整理优化：重命名列名、转换字段类型、删除冗余列、清理字段空格等冗余字符。
4️⃣ 数据筛选与提取：按条件 / 索引筛选目标行数据，通过表达式精准查询所需内容。
5️⃣ 数据合并与分组分析：拼接多张表格、按关键字段合并数据，分组聚合计算、统计数据频次及制作透视表。
这些都是数据清洗的基础核心操作，能帮助把杂乱的原始数据规整为可直接分析的格式。
#数据分析 #数据库 #数据科学 #编程 #Python #Pandas
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  1. CONNECT:[ UseTime:0.000994s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001480s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000700s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006221s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001381s ]
  6. SELECT * FROM `set` [ RunTime:0.002163s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001376s ]
  8. SELECT * FROM `article` WHERE `id` = 474202 LIMIT 1 [ RunTime:0.004378s ]
  9. UPDATE `article` SET `lasttime` = 1770479454 WHERE `id` = 474202 [ RunTime:0.008724s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002123s ]
  11. SELECT * FROM `article` WHERE `id` < 474202 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003161s ]
  12. SELECT * FROM `article` WHERE `id` > 474202 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001708s ]
  13. SELECT * FROM `article` WHERE `id` < 474202 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013443s ]
  14. SELECT * FROM `article` WHERE `id` < 474202 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021429s ]
  15. SELECT * FROM `article` WHERE `id` < 474202 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.040658s ]
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