Python ElementTree XML修改具有多个值的元素 [英] Python ElementTree XML Modifying Elements with Multiple Values

问题描述

使用Python 2.7和 lxml ，如何修改具有多个值的XML元素?

Using Python 2.7 and lxml, how do I modify XML elements with multiple values?

例如

    <Title>
      <Playcount>1</Playcount>
      <Genre>Adventure</Genre>
      <Genre>Comedy</Genre>
      <Genre>Action</Genre>
    </Title>

直接修改 Playcount ，因为它只有一个值.如何修改流派，女巫具有多个值?

It is straight forward to modify Playcount, as it has a single value. How do I modify Genre, witch has multiple values?

例如:

1. 如何删除除第一类以外的所有内容?

1. How do I delete all but the first genre?

如何添加流派?

谢谢.

推荐答案

就像这样::

from lxml import etree

parser = etree.XMLParser(remove_blank_text=True)
tree = etree.fromstring("""<Title>
    <Playcount>1</Playcount>
     <Genre>Adventure</Genre>
     <Genre>Comedy</Genre>
     <Genre>Action</Genre>
     <someTag>Text</someTag>
    </Title>""", parser=parser)

新播放次数:

playcount = tree.find('Playcount')
playcount.text = "2"

删除流派(不是第一流):

Delete genres (not first):

title = tree.xpath('/Title')[0]
genres = title.xpath('Genre')

for element in genres:
    if element.tag == "Genre" and element != title.xpath("Genre[1]")[0]:
        element.getparent().remove(element)

新类型:

genre = etree.Element("Genre")
genre.text = "New Genre"
tree.xpath('/Title/Genre[last()]')[0].addnext(genre)

结果:

print etree.tostring(tree, pretty_print=True)

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