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Python 数据分析:缺失值 + 重复值 + 数据类型一键清洗

  • 2026-06-28 22:54:25
Python 数据分析:缺失值 + 重复值 + 数据类型一键清洗
数据脏就没法分析？进阶清洗流水线：缺失填充、重复去重、类型修正，一套代码输出干净数据集。
场景：用户数据含缺失、重复、字符串数字混合。核心：isnull、duplicated、astype、fillna、str.replace。

① 生成测试数据（含脏数据）

import pandas as pdimport numpy as npdf = pd.DataFrame({    "uid": [1,2,2,3,4,np.nan,5],    "name": ["张三","李四","李四","王五","赵六","钱七","孙八"],    "age": ["25","30","30","35","-","42","38"],    "salary": [5000, np.nan, 6000, 7000, 4000, 6500, np.nan]})df.to_excel("dirty_user.xlsx", index=False)print(" dirty_user.xlsx 含脏数据已生成")
查看生成的数据情况

② 核心代码

import pandas as pddf = pd.read_excel("dirty_user.xlsx")# 去重df = df.drop_duplicates(subset=["uid"], keep="first")# 缺失UID删除df = df.dropna(subset=["uid"])# 清洗年龄df["age"] = df["age"].replace("-", "0").astype(int)# 薪资均值填充df["salary"] = df["salary"].fillna(df["salary"].mean()).round(0)print("清洗后：")print(df)
结果展示

总结

流水线式清洗大幅提升效率，代码可直接嵌入任何数据分析项目。

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  1. CONNECT:[ UseTime:0.001166s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001687s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000743s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000690s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001571s ]
  6. SELECT * FROM `set` [ RunTime:0.000605s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001839s ]
  8. SELECT * FROM `article` WHERE `id` = 487243 LIMIT 1 [ RunTime:0.000989s ]
  9. UPDATE `article` SET `lasttime` = 1783090483 WHERE `id` = 487243 [ RunTime:0.059314s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.008831s ]
  11. SELECT * FROM `article` WHERE `id` < 487243 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001251s ]
  12. SELECT * FROM `article` WHERE `id` > 487243 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003719s ]
  13. SELECT * FROM `article` WHERE `id` < 487243 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005273s ]
  14. SELECT * FROM `article` WHERE `id` < 487243 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001950s ]
  15. SELECT * FROM `article` WHERE `id` < 487243 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002536s ]
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