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一起学Python第96天:Pandas处理数据的筛选、排序、分组、合并

  • 2026-07-02 16:51:57
一起学Python第96天:Pandas处理数据的筛选、排序、分组、合并
欢迎来到【一起学Python】第95天!
今天我们将深入 Pandas 的核心引擎——数据操作。无论是精准定位、条件过滤、多维排序,还是分组统计与多表关联,这 4 大模块将覆盖你 90% 的日常分析需求。

数据选择与过滤

精准提取目标数据,是分析的第一步。Pandas 提供了三种主流定位方式:

 1.按标签选择 (loc)

import pandas as pddf = pd.DataFrame({    'Name': ['Alice''Bob''Charlie''David'],    'Age': [25, 30, 35, 40],    'City': ['New York''Los Angeles''Chicago''Houston']})# 选单列 / 多列age_col = df['Age']name_age = df[['Name''Age']]# 按行索引 + 列名定位print(df.loc[1, 'Name'])        # Bobprint(df.loc[1])                # 第2行完整数据

2.按位置选择 (iloc / iat)

# iloc 支持切片(行, 列)subset = df.iloc[0:21:3]      # 前2行,第2~3# iat 专攻单个元素(性能更高)first_val = df.iat[00]        # Alice

口诀loc 看名字,iloc 看序号,iat 取单值。

3.布尔索引(条件过滤)

# 单条件filtered = df[df['Age'] > 30]# 多条件(⚠️必须加括号,用 & 代替 and,| 代替 or)multi_filtered = df[(df['Age'] > 30) & (df['City'] == 'Chicago')]

数据排序

让数据按业务逻辑排列,洞察更直观。

# 单列排序(默认升序)sorted_age = df.sort_values(by='Age')# 降序排列sorted_desc = df.sort_values(by='Age', ascending=False)# 多列排序(先按城市升序,再按年龄降序)sorted_multi = df.sort_values(by=['City''Age'], ascending=[TrueFalse])

数据分组与聚合 (GroupBy)

Pandas 的 groupby 遵循 “拆分-应用-合并” 范式,是透视分析的基石。

df_group = pd.DataFrame({    'Name': ['Alice''Bob''Charlie''David''Eve'],    'Age': [25, 30, 35, 25, 30],    'City': ['New York''Los Angeles''Chicago''New York''Chicago']})# 1. 分组grouped = df_group.groupby('City')# 2. 单函数聚合city_avg_age = grouped['Age'].mean()# 3. 多函数聚合 (agg)agg_res = grouped.agg({    'Age': ['mean''max'],    'Name''count'})# 4. 多重聚合(去重计数 + 统计)multi_agg = df_group.groupby('Age').agg({    'City': pd.Series.nunique,  # 不同城市数量    'Name''count'             # 该年龄段人数})

groupby 返回的是分组对象,必须接聚合函数(如 .mean().sum().agg())才会真

数据合并与连接

实际业务中,数据往往散落在多张表里。Pandas 提供了 3 种拼接策略:

函数

核心逻辑

适用场景

pd.merge()

基于列值匹配(类似 SQL JOIN)

员工表+薪资表,通过 EmployeeID 关联

pd.concat()

基于轴向拼接(上下堆叠/左右并排)

多个月份的流水表垂直合并

df.join()

基于索引匹配

已设置好 Index 的表快速关联

实战示例

# 1. merge (类SQL JOIN)df1 = pd.DataFrame({'ID': [1,2,3], 'Name': ['A','B','C']})df2 = pd.DataFrame({'ID': [2,3,4], 'Score': [85,90,78]})inner = pd.merge(df1, df2, on='ID', how='inner')  # 仅保留匹配行left  = pd.merge(df1, df2, on='ID', how='left')   # 保留左表全部# 2. concat (垂直/水平拼接)df3 = pd.DataFrame({'Name': ['D','E'], 'Age': [28,32]})vertical = pd.concat([df1, df3], axis=0, ignore_index=True)  # 上下拼接,重置索引# 3. join (基于索引)df_a = pd.DataFrame({'Dept': ['HR','IT']}, index=[1,2])df_b = pd.DataFrame({'Salary': [7000,8000]}, index=[1,3])joined = df_a.join(df_b, how='left')  # 按索引左连接

 核心避坑指南(实战必看)

综合实战

将今日知识点串联,建议直接复制运行(已清理原稿中的拼写误差):

import pandas as pdimport numpy as np# 1. 基础数据df = pd.DataFrame({    'Name': ['Alice''Bob''Charlie''David'],    'Age': [25303540],    'City': ['New York''Los Angeles''Chicago''Houston']})# 2. 选择与过滤print("🔹 年龄>30的人员:\n", df[df['Age'] > 30])# 3. 排序print("\n🔹 按年龄降序:\n", df.sort_values('Age', ascending=False))# 4. 分组聚合df_g = pd.DataFrame({    'Name': ['Alice''Bob''Charlie''David''Eve'],    'Age': [2530352530],    'City': ['New York''Los Angeles''Chicago''New York''Chicago']})print("\n🔹 各城市平均年龄:\n", df_g.groupby('City')['Age'].mean())# 5. 表合并df1 = pd.DataFrame({'ID': [123], 'Name': ['A''B''C']})df2 = pd.DataFrame({'ID': [234], 'Score': [859078]})merged = pd.merge(df1, df2, on='ID', how='left')print("\n🔹 左连接结果:\n", merged)

今日知识点

【一起学Python】每天进步一点点,365天后遇见更优秀的自己!

👉 关注公众号,不错过每天的学习内容!

🎯 今日金句:

"数据的质量,决定分析的上限;清洗的耐心,成就洞察的深度。"

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  1. CONNECT:[ UseTime:0.000618s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000818s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000654s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002227s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.003942s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000612s ]
  8. SELECT * FROM `article` WHERE `id` = 495927 LIMIT 1 [ RunTime:0.000739s ]
  9. UPDATE `article` SET `lasttime` = 1783032279 WHERE `id` = 495927 [ RunTime:0.006579s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000282s ]
  11. SELECT * FROM `article` WHERE `id` < 495927 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000505s ]
  12. SELECT * FROM `article` WHERE `id` > 495927 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000347s ]
  13. SELECT * FROM `article` WHERE `id` < 495927 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000691s ]
  14. SELECT * FROM `article` WHERE `id` < 495927 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001840s ]
  15. SELECT * FROM `article` WHERE `id` < 495927 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009308s ]
0.097573s