Python大数据分析与应用实战

第 1 章 Python 语法基础 ··························· 1

1.1 安装 Anaconda ····································· 1

1.1.1 代码提示 ······························· 4

1.1.2 变量浏览 ······························· 5

1.1.3 安装第三方库 ························· 5

1.2 语法基础 ············································ 6

1.2.1 字符串、列表、元组、字典和

集合 ····································· 6

1.2.2 条件判断、循环和函数 ··········· 13

1.2.3 异常 ··································· 17

1.2.4 特殊函数 ····························· 20

1.3 Python 基础库应用入门 ························ 22

1.3.1 NumPy 库应用入门 ················ 23

1.3.2 Pandas 库应用入门 ················· 29

1.3.3 Matplotlib 库应用入门 ············· 40

1.4 本章小结 ·········································· 45

第 2 章 天气数据的获取与建模分析 ·········· 52

2.1 准备工作 ·········································· 52

2.2 利用抓取方法获取天气数据 ·················· 54

2.2.1 网页解析 ····························· 54

2.2.2 抓取一个静态页面中的天气

数据 ··································· 57

2.2.3 抓取历史天气数据 ················· 60

2.3 天气数据可视化 ································· 63

2.3.1 查看数据基本信息 ················· 63

2.3.2 变换数据格式 ······················· 64

2.3.3 气温走势的折线图 ················· 66

2.3.4 历年气温对比图 ···················· 67

2.3.5 天气情况的柱状图 ················· 69

2.3.6 使用 Tableau 制作天气情况的

气泡云图 ····························· 70

2.3.7 风向占比的饼图 ···················· 73

2.3.8 使用 windrose 库绘制风玫瑰图 ·· 74

2.4 机器学习在天气预报中的应用 ··············· 76

2.4.1 线性回归的基本概念 ·············· 76

2.4.2 使用一元线性回归预测气温 ····· 77

2.4.3 使用多元线性回归预测气温 ····· 85

2.5 本章小结 ·········································· 91

第 3 章 养成游戏中人物的数据搭建 ·········· 92

3.1 准备工作 ·········································· 92

3.2 利用 Pyecharts 库进行数据基本情况分析 ··· 93

3.2.1 感染人数分布图 ···················· 94

3.2.2 病情分布图 ·························· 96

3.2.3 病症情况堆叠图 ···················· 97

3.2.4 绘制出院、死亡情况折线图 ····· 98

3.2.5 病情热力图 ························· 100

3.2.6 病情分布象形图 ··················· 101

3.2.7 人口流动示意图 ··················· 103

| Python 大数据分析与应用实战 |

VI

3.3 感染病例分析 ··································· 105

3.3.1 基本信息统计 ······················ 106

3.3.2 使用直方图展示感染周期 ······· 108

3.3.3 使用词云图展示死亡病例情况 ··· 111

3.4 疫情趋势预测 ··································· 114

3.4.1 利用逻辑方程预测感染人数 ···· 115

3.4.2 利用 SIR 模型进行疫情预测 ···· 120

3.4.3 Logistic 模型和 SIR 模型的

对比 ·································· 128

3.5 本章小结 ········································· 131

第 4 章 航空数据分析 ···························· 132

4.1 准备工作 ········································· 132

4.2 基本情况统计分析 ····························· 135

4.2.1 查看数据的基本信息 ············· 135

4.2.2 航空公司、机型分布 ············· 137

4.2.3 展示各个城市航班数量的 3D

地图 ·································· 139

4.2.4 从首都机场出发的桑基图 ······· 142

4.2.5 通过关系图展示航线 ············· 145

4.3 利用 Floyd 算法计算*短飞行时间 ········· 148

4.3.1 Floyd 算法简介 ···················· 148

4.3.2 Floyd 算法的流程 ················· 150

4.3.3 算法程序实现 ······················ 150

4.3.4 结果分析 ···························· 154

4.4 本章小结 ········································· 158

第 5 章 市民服务热线文本数据分析 ········· 160

5.1 准备工作 ········································· 160

5.2 基本情况分析 ··································· 162

5.2.1 数据分布基本信息 ················ 162

5.2.2 每日平均工单量分析 ············· 165

5.2.3 来电时间分析 ······················ 166

5.2.4 工单类型分析 ······················ 167

5.3 利用词云图展示工单内容 ···················· 171

5.3.1 工单分词 ···························· 171

5.3.2 去除停用词 ························· 172

5.3.3 词频统计 ···························· 173

5.3.4 市民反映问题词云图 ············· 175

5.3.5 保存数据 ···························· 176

5.4 基于朴素贝叶斯的工单自动分类转办 ····· 177

5.4.1 需求概述 ···························· 177

5.4.2 朴素贝叶斯模型的基本概念 ···· 177

5.4.3 朴素贝叶斯文本分类算法的

流程 ·································· 181

5.4.4 程序实现 ···························· 182

5.5 基于 K-Means 算法和 PCA 方法降维的

热点问题挖掘 ··································· 189

5.5.1 应用场景 ···························· 189

5.5.2 K-Means 算法和 PCA 方法的

基本原理 ···························· 189

5.5.3 热点问题挖掘算法的流程 ······· 193

5.5.4 程序实现 ···························· 194

5.6 本章小结 ········································· 205

第 6 章 决策树信贷风险控制 ·················· 206

6.1 准备工作 ········································· 206

6.2 数据集基本情况分析 ·························· 209

6.2.1 查看数据大小和缺失情况 ······· 209

6.2.2 绘制直方图查看数据的分布

情况 ·································· 211

6.2.3 绘制直方图的 3 种方法 ·········· 212

| 目录 |

VII

6.2.4 通过箱型图查看异常值的情况 ···· 213

6.2.5 异常值和缺失值的处理 ·········· 217

6.2.6 使用小提琴图展示预处理后的

数据 ·································· 218

6.3 利用决策树进行信贷数据建模 ·············· 219

6.3.1 决策树原理简介 ··················· 219

6.3.2 决策树信贷建模流程 ············· 225

6.3.3 利用 scikit-learn 库实现决策树

风险控制算法 ······················ 226

6.3.4 模型优化 ···························· 231

6.4 本章小结 ········································· 233

第 7 章 利用深度学习进行垃圾图片分类 ···· 234

7.1 准备工作 ········································· 234

7.2 深度学习的基本原理 ·························· 237

7.2.1 CNN 的基本原理 ·················· 237

7.2.2 Keras 库简介 ······················· 240

7.3 利用 Keras 库实现基于 CNN 的垃圾

图片分类 ········································ 241

7.3.1 算法流程 ···························· 241

7.3.2 数据预处理 ························· 241

7.3.3 CNN 模型实现 ····················· 247

7.4 优化 CNN 模型 ································· 252

7.4.1 选择优化器 ························· 252

7.4.2 选择损失函数 ······················ 254

7.4.3 调整模型 ···························· 256

7.4.4 图片增强 ···························· 259

7.4.5 改变学习率 ························· 263

7.5 模型应用 ········································· 265

7.6 本章小结 ········································· 268

第 8 章 协同过滤和矩阵分解推荐算法

分析 ········································· 269

8.1 准备工作 ········································· 269

8.2 基于协同过滤算法的短视频完播情况

分析 ··············································· 271

8.2.1 基于用户的协同过滤算法的

原理 ·································· 271

8.2.2 算法流程 ···························· 274

8.2.3 程序实现 ···························· 275

8.3 基于矩阵分解算法的短视频完播情况

预测 ·············································· 283

8.3.1 算法原理 ···························· 283

8.3.2 利用 Surprise 库实现 SVD

算法 ·································· 286

8.4 几种方法在测试集中的表现 ················· 289

8.5 本章小结 ········································· 291

第 9 章 《红楼梦》文本数据分析 ············ 292

9.1 准备工作 ········································· 292

9.1.1 编程环境 ···························· 292

9.1.2 数据情况简介 ······················ 293

9.2 分词 ··············································· 294

9.2.1 读取数据 ···························· 295

9.2.2 数据预处理 ························· 298

9.2.3 分词及去除停用词 ················ 306

9.2.4 制作词云图 ························· 307

9.3 文本聚类分析 ··································· 316

9.3.1 构建分词 TF-IDF 矩阵 ··········· 317

9.3.2 K-Means 聚类 ······················ 318

9.3.3 MDS 降维 ··························· 320

9.3.4 PCA 降维 ··························· 321

| Python 大数据分析与应用实战 |

VIII

9.3.5 HC 聚类 ····························· 323

9.3.6 t -SNE 高维数据可视化 ·········· 325

9.4 LDA 主题模型 ·································· 326

9.5 人物社交网络分析 ····························· 332

9.6 本章小结 ········································· 338

附录 A 抓取数据请求头查询 ··················· 339

附录 B GraphViz 库的安装方法 ·············· 341

附录 C 在 Windows 10 中安装 TensorFlow

的方法 ······································ 343

参考文献 ··············································· 346

致谢 ····················································· 34