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BeautifulSoup 中父节点、祖先节点和兄弟节点操作

父节点和祖先节点

在BeautifulSoup中获取节点的父节点非常简单，可以通过节点的parent属性实现。每个节点都有一个父节点， Parents属性则返回该节点的所有祖先节点。

示例代码：

html = """
Elsie
"""from bs4 importBeautifulSoupsoup = BeautifulSoup(html, 'lxml')print(type(soup.a.parents))print(list(enumerate(soup.a.parents)))

示例输出：

   
    [(0, 
    
Elsie
      
      
      
   

兄弟节点

获取兄弟节点可以使用next_sibling``及其它相关属性。**next_sibling**和previous_sibling``获取的是下一个和上一个直接的兄弟节点，而next_siblings和previous_siblings则返回所有兄弟节点包括中间有其他元素的空节点。

示例代码：

html = """
		Once upon a time there were little sisters; and their names were		Elsie		Hello		Lacie		and		Tillie		and they lived at the bottom of a well.
"""from bs4 import BeautifulSoupsoup = BeautifulSoup(html, 'lxml')print('Next Sibling', soup.a.next_sibling)print('Prev Sibling', soup.a.previous_sibling)print('Next Siblings', list(enumerate(soup.a.next_siblings)))print('Prev Siblings', list(enumerate(soup.a.previous_siblings)))

示例输出：

Next Sibling: HelloPrev Sibling: Once upon a time there were little sisters; and their names wereNext Siblings: [(0, '\n	Hello\n'), (1, Lacie), (2, '\n	and\n'), (3, Tillie), (4, '\n	and they lived at the bottom of a well.\n')]Prev Siblings: [(0, '\n	Once upon a time there were little sisters; and their names were\n')]

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