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README.md

lxml

  1. link
  2. installation
    • conda install -c conda-forge lxml
    • pip install lxml
    • 如使用css：conda install -c conda-forge cssselect, pip install cssselect
  3. usage: from lxml import etree
  4. XPath使用路径表达式：选取xml文档中的节点或节点集
  5. Extensible Stylesheet Language Transformations (XSLT)
  6. XQuery, XPointer
  7. 节点类型
    • 元素
    • 属性
    • 文本
    • 命名空间
    • 处理指令
    • 注释
    • 文档节点（根节点）
  8. 项目item
    • 基本值atomic value：无父或无子的节点
    • 节点

misc

  1. /AA/BB/CC: absolute path
  2. AA/BB/CC, ./AA/BB/CC: relative path
  3. //AA/BB/CC: start anywhere
  4. //AA/@bb: attribute
  5. []: condition
    • [1], [last()], [last()-1]: indexing
    • [@aa], [@aa="233"]: attribute
    • [@*], [not(@*)]
  6. misc function
    • [name()="233"]
    • [starts-with(name(), "233"]
    • [contains(name(),"233")]
    • [count(*)=2]
    • [string-length(name())=3]
  7. /AA | /BB: or
  8. ::: axis, child:: is the default axis
    • child::
    • descendant::
    • parent::
    • ancestor::
  9. numeric operations
    • [position() mod 2 = 0]
    • [position() = floor(last() div 2 + 0.5) or position() = ceiling(last() div 2 + 0.5)]