Python:xPath在ElementTree中不可用 [英] Python: xPath not available in ElementTree

问题描述

我正在尝试使用 ElementTree 的 iterparse()来解析iTunes播放列表，但出现以下错误:

I am trying to parse iTunes Playlist by using iterparse() of ElementTree but getting following error:

AttributeError: 'Element' object has no attribute 'xpath'

代码如下:

import xml.etree.ElementTree as ET
context = ET.iterparse(file,events=("start", "end"))
    # turn it into an iterator
    context = iter(context)
    # get the root element
    event, root = context.next()
    for event, elem in context:
        z = elem.xpath(".//key")
        elem.clear()
        root.clear()
    print z

我做错了什么?文件太大，因此无论如何我都必须使用 iterparse().

What I am doing wrong? File is too big so I have to use iterparse() anyway.

推荐答案

xml.etree.ElementTree 为XPath表达式提供了有限的支持为其 Element 类 <代码>查找 ， findall 和

xml.etree.ElementTree provides limited support for XPath expressions for its Element class find, findall and findtext methods (there's no xpath method: that's why you are getting an error).

此外，如果您在元素上调用 clear()以节省使用的内存，则仅需完成之后，才需要执行此操作，孩子们.

Also, if you call clear() on an element to conserve used memory, you need to do it only after you've finished processing the element and all its children.

因此，您需要将代码更改为类似于以下内容的代码:

Therefore, you need to to change your code to something similar to the following:

for event, elem in context:
    for child in elem.findall(".//key"):
        # process child
    elem.clear()
    root.clear()

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