news 2026/4/18 8:04:33

Pandas 数据处理

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Pandas 数据处理

数据处理基础概念

  • 数据处理的定义与重要性
  • Pandas在数据处理中的核心作用
  • 常见数据结构:Series与DataFrame

数据导入与导出

  • 支持的文件格式(CSV、Excel、JSON等)
  • 使用read_csv()read_excel()等函数加载数据
  • 数据导出方法:to_csv()to_excel()

数据清洗与预处理

  • 缺失值处理:isna()fillna()dropna()
  • 重复值处理:duplicated()drop_duplicates()
  • 数据类型转换:astype()to_datetime()

数据筛选与排序

  • 条件筛选:布尔索引、query()方法
  • 列选择与行切片:loc[]iloc[]
  • 排序操作:sort_values()sort_index()

数据聚合与分组

  • 分组操作:groupby()的原理与应用
  • 聚合函数:sum()mean()agg()
  • 透视表与交叉表:pivot_table()crosstab()

数据合并与连接

  • 纵向合并:concat()
  • 横向合并:merge()join()
  • 键值匹配与合并方式(内连接、外连接等)

高级数据处理技巧

  • 向量化操作与apply()函数
  • 窗口计算:rolling()expanding()
  • 自定义函数与Lambda表达式应用

性能优化与实战建议

  • 大数据集处理技巧:分块读取、数据类型优化
  • 避免常见陷阱(内存泄漏、循环低效等)
  • 实际案例分析与代码示范

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