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一起学Python第93天:Pandas核心数据结构

  • 2026-07-02 16:43:58
一起学Python第93天:Pandas核心数据结构
欢迎回到【一起学Python】系列!
今天是第93天,我们将正式踏入数据分析的核心领域。Pandas 之所以强大,离不开它的两大基石数据结构:Series 和 DataFrame。掌握它们,你就拿到了处理表格数据的“万能钥匙”🔑。

Series:一维带标签数组

Series 可以理解为**“自带索引的一维数组”**。无论是整数、浮点数还是字符串,它都能装下,并且支持通过“标签”精准定位。

🛠️ 如何创建?

import pandas as pd# 1. 从列表创建(默认生成 0,1,2... 索引)data_list = [12345]s1 = pd.Series(data_list)# 2. 从字典创建(字典的键自动成为索引)data_dict = {'a'1'b'2'c'3}s2 = pd.Series(data_dict)# 3. 自定义索引s3 = pd.Series(data_list, index=['one''two''three''four''five'])
💡 小贴士:字典转 Series 是处理映射关系最高效的方式之一。

🔍 如何访问?

# 按位置访问print(s1[0])               # 输出: 1# 按标签访问print(s2['b'])             # 输出: 2# 切片访问print(s1[:2])              # 输出前两个# 按索引列表访问print(s3[['one''three']]) # 输出指定标签的值

📊 常用属性与方法

len(s1)      # 长度s1.index     # 索引对象s1.values    # 底层值数组s1.max()     # 最大值s1.min()     # 最小值s1.sum()     # 求和s1.mean()    # 均值

DataFrame:二维“数据表格”

如果把 Series 比作一列数据,那 DataFrame 就是完整的 Excel 表格或数据库表。它由行(Index)和列(Columns)组成,每一列本质上就是一个 Series

🛠️ 如何创建?

import numpy as np# 1. 从字典创建(最推荐,键名自动作列名)df1 = pd.DataFrame({    'Name': ['Alice''Bob''Charlie'],    'Age': [253035],    'City': ['New York''Los Angeles''Chicago']})# 2. 从二维数组创建(需手动指定列名)arr = np.array([[1'Alice'25], [2'Bob'30], [3'Charlie'35]])df2 = pd.DataFrame(arr, columns=['ID''Name''Age'])

核心访问:iloc vs loc

这是 Pandas 最容易踩坑的地方,请务必分清:
# iloc:纯整数位置访问(行号, 列号)print(df1.iloc[0, 1])   # 第1行第2列 → Alice# loc:标签索引访问(行标签, 列名)print(df1.loc[1, 'Name']) # 索引为1的行,Name列 → Bob# 获取整行 / 整列print(df1.iloc[1])      # 第2行整行print(df1['City'])      # 'City' 整列

📊 常用属性与方法

df1.shape        # 形状 (行数, 列数) → (3, 3)df1.columns      # 列名df1.index        # 行索引df1.describe()   # 数值列描述性统计(计数/均值/标准差/最值等)df1.head()       # 预览前5行df1.tail()       # 预览后5行

📥 实战高频:读取外部文件

实际工作中,90% 的分析都从这一步开始:
df_csv = pd.read_csv('data.csv')       # 读取 CSVdf_excel = pd.read_excel('data.xlsx')  # 读取 Exceldf_json = pd.read_json('data.json')    # 读取 JSON
⚠️ 注意:请确保文件路径正确,相对路径默认以当前 Python 脚本所在目录为准。

🚀 综合实战:一气呵成

将今日知识点串联,建议亲手敲一遍,肌肉记忆比看十遍都管用!

import pandas as pdimport numpy as np# 1. 创建与访问 Seriess = pd.Series([12345])print("Series最大值:", s.max())# 2. 创建与访问 DataFramedf = pd.DataFrame({    'Name': ['Alice''Bob''Charlie'],    'Age': [253035],    'City': ['New York''Los Angeles''Chicago']})print("\n第一行数据:\n", df.iloc[0])print("DataFrame形状:", df.shape)# 3. 描述性统计print("\n数值列统计:\n", df.describe())
💻 预期输出:控制台将依次打印 Series 的最大值、DataFrame 的首行数据、形状 (3, 3),以及 Age 列的计数、均值、标准差、最小/最大值等统计信息。

📝 今日知识速记卡

结构

维度

核心特点

典型场景

Series

1维

带索引的一维数组

单列数据、时间序列、基础统计

DataFrame

2维

表格结构,列是 Series

数据清洗、分析、可视化、建模输入

避坑指南

  1. iloc 看位置loc 看标签,混用极易触发 IndexError 或 KeyError
  2. .describe() 默认只对数值列生效,字符串列会被自动跳过(符合设计逻辑,无需手动过滤)。
  3. 创建 DataFrame 时,字典的键顺序即为列顺序;若需调整,可使用 columns=['列名1', '列名2'] 参数。

💬 互动话题: 你在日常处理数据时,更习惯用 loc 还是 iloc?有没有被索引报错“坑”过的经历?欢迎在评论区分享你的踩坑与解法~👇

📌 点赞 + 在看 + 星标,明天推送准时送达!我们第94天见!🐾

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  1. CONNECT:[ UseTime:0.000520s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000774s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000310s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000259s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000489s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000505s ]
  8. SELECT * FROM `article` WHERE `id` = 495292 LIMIT 1 [ RunTime:0.029083s ]
  9. UPDATE `article` SET `lasttime` = 1783064172 WHERE `id` = 495292 [ RunTime:0.012621s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000286s ]
  11. SELECT * FROM `article` WHERE `id` < 495292 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000614s ]
  12. SELECT * FROM `article` WHERE `id` > 495292 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000436s ]
  13. SELECT * FROM `article` WHERE `id` < 495292 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001055s ]
  14. SELECT * FROM `article` WHERE `id` < 495292 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013097s ]
  15. SELECT * FROM `article` WHERE `id` < 495292 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000888s ]
0.129388s