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    "\n",
    "# 第四章 数据清洗\n",
    "\n"
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    "数据清洗（data cleaning）是数据分析的重要步骤，其主要目标是将混杂的数据清洗为可以被直接分析的数据，一般需要将数据转化为数据框（data frame）的样式。\n",
    "\n",
    "本章将以推特文本的清洗作为例子，介绍数据清洗的基本逻辑。\n",
    "\n",
    "- 介绍通过按行或块的方式对大规模数据进行预处理\n",
    "- 清洗错误行和列\n",
    "- 提取所要分析的内容\n",
    "- 使用Pandas进行数据清洗\n",
    "\n",
    "\n",
    "\n"
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