Python 科学计算库—NumPy pandas库基础 异常 文件操作
Python概述 基础语法 判断 循环 函数 数据容器 函数进阶 Jupyter notebook
第2章 科学计算库—NumPy
NumPy作为高性能科学计算和数据分析的基础包,它是 众多数据分析、机器学习等工具的基础架构,掌握 NumPy的功能及其用法将有助于后续其他数据分析工具的学习。本章将针对NumPy库的基础功能进行详细地讲解。
NumPy中提供了一个重要的数据结构是ndarray(又称为array)对象,该对象是一个N 维数组对象,可以存储相同类型、以多种形式组织的数据。 与Python中的数组相比,ndarray对象可以处理结构更复杂的数据
2.1数组对象
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白色部分是原始数值;红绿部分是a,b广播相加的补充;
shape属性表示数组的形状,也就是数组中各维度的大小,该属性的值为一个形如(行,列)的元组。
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2.2创建数组
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2.3访问数组元素
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2.3.1整数索引
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2.3.2花式索引
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2.3.3布尔索引
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2.35使用切片访问元素
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2.4数组运算
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2.4.2 形状不同的数组-广播机制 (期末要考)
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2.5数组操作-排序&检索
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2.6数组的转置
数组的转置指数组中各元素按照一定的规则变换位置。NumPy中提供了三种实现数组转置的方式,分别为T属性、transpose()方法、swapaxes()方法。
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第三章pandas库基础
pandas是一个基于NumPy,专门为数据分析而设计的库,该库中不仅提供了大量的库及一些标准的数据模型,还提供了高效操作数据集的数据结构,被广泛地应用到众多领域中。
3.1数据结构
3.1.1 Series
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3.1.2 DataFrame
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3.2索引操作
3.2.1 索引对象
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3.2.2 使用单层索引访问数据
pandas 中 可 以 使 用 [] 、 loc 、 iloc 、 at 和 iat 这几 种 方 式 访 问 Series 类对 象 和DataFrame类对象的数据。
1. 使用[]访问数据
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2. 使用loc和iloc访问数据
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3. 使用at和iat访问数据
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3.2.3 使用分层索引访问数据
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3.2.4 重新索引reindex()
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3.3数据排序
3.3.1 按索引排序
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3.3.2 按值排序
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3.4统计计算与描述
3.4.1 统计计算
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3.4.2 统计描述
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3.5绘制图表
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第八章 文件操作
8.1文件的编码
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8.2文件的读取
8.2.0文件的操作步骤
① 打开文件
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② 读写文件
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③ 关闭文件
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8.3文件的写入
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8.4文件的追加
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8.5文件操作综合案例
第九章-异常、模块与包
了解异常
异常就是程序运行的过程中出现了错误
异常的捕获方法
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异常的传递
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Python模块
导入模块
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自定义模块
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注意事项:当导入多个模块的时候,且模块内有同名功能. 当调用这个同名功能的时候,调用到的是后面导入的模块的功能
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Python包
自定义包
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安装第三方Python包
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https://pypi.tuna.tsinghua.edu.cn/simple 是清华大学提供的一个网站,可供pip程序下载第三方包
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本文来自博客园,作者:软工菜鸡,转载请注明原文链接:https://www.cnblogs.com/SElearner/p/17676667.html