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Python数据分析:groupby分组函数

  • 2026-02-05 00:53:39
Python数据分析:groupby分组函数

📊 Python数据分析利器:深入掌握 Pandas 的 groupby 函数

在进行数据分析时,我们经常需要对数据按照某些特征进行分组,然后对每组数据进行统计、聚合或转换。Pandas 中的 groupby 函数正是为此而生,它是数据分析中最常用、最强大的工具之一。

今天,我们就来系统梳理 groupby 的常见用法,从基础到进阶,助你轻松玩转分组分析!


1️⃣ 一列分组 + 一列聚合(最基础用法)

假设我们有一个销售数据表,包含「城市」和「销售额」两列:

import pandas as pddf = pd.DataFrame({'city': ['北京''上海''北京''广州''上海'],'sales': [100150200120180]})

我们想按城市汇总总销售额:

result = df.groupby('city')['sales'].sum()print(result)

输出:

city北京    300上海    330广州    120Name: sales, dtype: int64

✅ 要点

  • groupby('city') 按城市分组
  • ['sales'] 选择要聚合的列
  • .sum() 是聚合函数(也可用 mean、max、count 等)

2️⃣ 一列分组 + 多列聚合

如果数据包含多列数值,比如「销售额」和「利润」:

df = pd.DataFrame({'city': ['北京''上海''北京''广州''上海'],'sales': [100150200120180],'profit': [2030402535]})

我们可以对多个列同时聚合:

result = df.groupby('city')[['sales''profit']].sum()print(result)

输出:

      sales  profitcity              北京     300      60上海     330      65广州     120      25

💡 也可以使用 agg() 实现更灵活的聚合(见第4部分)。


3️⃣ 多列分组 + 多列聚合

当需要按多个维度分组时(如「城市」+「产品类别」):

df = pd.DataFrame({'city': ['北京''北京''上海''上海''北京'],'category': ['A''B''A''B''A'],'sales': [100150200120180],'profit': [2030402535]})result = df.groupby(['city''category'])[['sales''profit']].sum()print(result)

输出(MultiIndex):

               sales  profitcity category              北京 A           280      55     B           150      30上海 A           200      40     B           120      25

📌 使用 reset_index() 可将分组键转为普通列:

result.reset_index(inplace=True)

4️⃣ groupby + agg:自定义聚合方式

agg() 允许对不同列应用不同的聚合函数,甚至多个函数!

result = df.groupby('city').agg({'sales''sum','profit': ['mean''max']})print(result)

输出:

      sales profit              sum   mean maxcity                  北京     330   32.5  35上海     320   32.5  40

✨ 还可以传入自定义函数或 lambda:

df.groupby('city').agg({'sales'lambda x: x.max() - x.min(),'profit''std'})

5️⃣ groupby + transform:保留原始结构的分组操作

与 agg 不同,transform 返回与原 DataFrame 相同形状的结果,常用于标准化、填充缺失值等场景。

例如:计算每个城市销售额占该城市总销售额的比例:

df['sales_ratio'] = df['sales'] / df.groupby('city')['sales'].transform('sum')print(df)

输出:

  city category  sales  profit  sales_ratio0   北京        A    100      20     0.3030301   北京        B    150      30     0.4545452   上海        A    200      40     0.6250003   上海        B    120      25     0.3750004   北京        A    180      35     0.545455

✅ transform 的关键优势:不改变原始行数,结果可直接作为新列加入原表。


🔚 小结

场景
代码示例
特点
单列分组单列聚合
df.groupby('A')['B'].sum()
最基础
单列分组多列聚合
df.groupby('A')[['B','C']].mean()
批量处理
多列分组多列聚合
df.groupby(['A','B'])[['C','D']].sum()
多维分析
自定义聚合
df.groupby('A').agg({'B':'sum', 'C':['mean','max']})
灵活强大
分组变换
df.groupby('A')['B'].transform('mean')
保持原结构

掌握这些 groupby 技巧,你的数据分析效率将大幅提升!赶紧在你的项目中试试吧~


📘 小贴士

  • groupby 后默认会丢弃 NaN 分组(可通过 dropna=False 保留)
  • 使用 as_index=False 可避免分组列变成索引
  • 结合 apply() 可实现更复杂的自定义逻辑

如果你觉得这篇文章有帮助,欢迎点赞、转发,让更多人一起学好 Python 数据分析!🚀

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  1. CONNECT:[ UseTime:0.001089s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001768s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000739s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007603s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001645s ]
  6. SELECT * FROM `set` [ RunTime:0.000551s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001012s ]
  8. SELECT * FROM `article` WHERE `id` = 471890 LIMIT 1 [ RunTime:0.008763s ]
  9. UPDATE `article` SET `lasttime` = 1770437828 WHERE `id` = 471890 [ RunTime:0.004432s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011970s ]
  11. SELECT * FROM `article` WHERE `id` < 471890 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002906s ]
  12. SELECT * FROM `article` WHERE `id` > 471890 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 471890 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008271s ]
  14. SELECT * FROM `article` WHERE `id` < 471890 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.093425s ]
  15. SELECT * FROM `article` WHERE `id` < 471890 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002437s ]
0.304192s