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Python数据分析顶流库Pandas全套干货|Part.2

  • 2026-04-17 19:23:45
Python数据分析顶流库Pandas全套干货|Part.2
(喜欢文章的朋友一定要点赞关注呀~)

第二篇:Pandas核心基础操作📂文件读写+数据查看+精准筛选

上一篇我们认识了Pandas的核心概念和两大对象,本篇进入实战核心环节,也是日常使用频率最高的操作:数据文件读写、基础信息查看、行列数据筛选

不管是Excel、CSV还是TXT文件,Pandas都能轻松读取,几行代码就能精准提取目标数据,彻底告别手动翻表格、筛选数据的繁琐,全程代码可直接复制运行,新手看完就能上手处理真实数据✨

📤 最常用:各类数据文件读写(职场必备)

Pandas支持十几种数据格式读写,日常最常用的是CSVExcel,代码极简,注意路径和编码问题即可,彻底解决文件兼容难题。

1. Excel文件读写(处理.xlsx/.xls)

(设计一个test.xlsx文件)
import pandas as pd# 读取Excel文件,sheet_name指定工作表,默认第一个df = pd.read_excel('test.xlsx', sheet_name='Sheet1')# 读取指定列,避免多余数据df = pd.read_excel('test.xlsx', usecols=['姓名''数学''语文'])# 数据处理后,写入Excel文件df.to_excel('处理后成绩表.xlsx', index=False)  # index=False 不保存行索引
由于读取XLSX文件需要单独的引擎,因此可能还需要再装一个库:
pip install openpyxl

2. CSV文件读写(处理.csv,大数据首选)

# 读取CSV文件,encoding指定编码,中文用utf-8或gbkdf = pd.read_csv('学生成绩表.csv', encoding='utf-8')# 写入CSV文件df.to_csv('处理后成绩表.csv', index=False, encoding='utf-8')

💡 读写避坑小技巧

  • 中文乱码:编码切换为gbk或gb2312;

  • 文件路径:用绝对路径,避免相对路径报错;

  • 大数据:优先用CSV,比Excel读取更快。

👀 数据快速查看:读懂数据基本信息

读取数据后,先通过核心函数查看数据结构、内容、缺失值,快速掌握数据概况,不用逐行翻找:

# 查看前5行数据(默认),括号填数字查看指定行数print(df.head(3))# 查看后5行数据print(df.tail(3))# 查看数据基本信息(行列数、数据类型、缺失值、内存占用)print(df.info())# 查看数据统计描述(均值、最值、标准差、分位数)print(df.describe())# 查看行列数print(f"数据形状:{df.shape[0]}行,{df.shape[1]}列")# 查看列名print(df.columns.tolist())

🔍 精准数据筛选:提取目标内容(核心)

Pandas筛选功能远超Excel,支持按列、按行、按条件精准提取,灵活度拉满,日常筛选全靠这几个方法:

1. 按列筛选(提取单列/多列)

# 提取单列,返回Seriesname_col = df['姓名']print("姓名列:", name_col)# 提取多列,返回DataFramescore_df = df[['姓名''数学''语文']]print("成绩列:", score_df)

2. 按行筛选(按索引/位置)

# loc:按行索引标签筛选df_loc = df.loc[0:2]  # 筛选前3print("loc[0:2]:", df_loc)# iloc:按行位置索引筛选df_iloc = df.iloc[0:2]  # 筛选前2print("iloc[0:2]:", df_iloc)# 筛选指定行+指定列df_select = df.loc[0:2, ['姓名', '数学']]print("loc[0:2, ['姓名', '数学']]:", df_select)

3. 按条件筛选(最常用,批量过滤)

# 单条件筛选:数学成绩大于90分high_math = df[df['数学'] > 90]print("high_math:", high_math)# 多条件筛选:女生且数学大于85分(&且,|或,加括号)condition_df = df[(df['性别'] == '女') & (df['数学'] > 85)]print("condition_df:", condition_df)# 包含指定字符筛选:姓名包含“小”name_contains = df[df['姓名'].str.contains('小', na=False)]print("name_contains:", name_contains)

📌 第二篇小结+下篇预告

本篇我们掌握了Pandas最核心的基础操作:文件读写、数据查看、行列筛选,覆盖日常数据处理70%的基础需求,能轻松处理各类表格数据。第三篇将讲解数据清洗核心技巧:缺失值、重复值、异常值处理,搞定脏数据,让数据更规范,彻底解决数据预处理难题~


往期回顾:
Python数据分析顶流库Pandas全套干货|Part.1
Python学习笔记——从入门到报废(十二、函数(上))
Python数据分析基石NumPy全套干货Part.1
Python学习笔记——从入门到报废(十、循环(中))
Python可视化天花板|wordcloud词云库,搭配jieba做出高颜值创意图!

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  1. CONNECT:[ UseTime:0.000405s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000525s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000254s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000313s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000512s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000529s ]
  8. SELECT * FROM `article` WHERE `id` = 484260 LIMIT 1 [ RunTime:0.001075s ]
  9. UPDATE `article` SET `lasttime` = 1776761909 WHERE `id` = 484260 [ RunTime:0.000641s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 484260 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000395s ]
  12. SELECT * FROM `article` WHERE `id` > 484260 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000529s ]
  13. SELECT * FROM `article` WHERE `id` < 484260 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001016s ]
  14. SELECT * FROM `article` WHERE `id` < 484260 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001474s ]
  15. SELECT * FROM `article` WHERE `id` < 484260 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001492s ]
0.076548s