英文:
XPath SyntaxError: invalid predicate with text()
问题
以下是翻译好的部分：
在Python中使用我认为是有效的XPath表达式时，我遇到了“SyntaxError: invalid predicate”错误。
我的代码是：
import xml.etree.ElementTree as ET
data = '''<root>
<child>
<p>aaa</p>
<p>bbb</p>
</child>
</root>'''
root = ET.fromstring(data)
p_element = root.findall(".//p[text()='aaa']")
print(p_element[0].text)
运行这段代码会产生无效的谓词错误，但我认为它是正确的。我使用的是Python版本3.10.0，并在Windows上运行。
似乎与XPath中的text()部分有关；如果将其删除，就不会出现错误。
英文:
What am I doing wrong?
When using what I believe to be a valid XPath expression in Python, I get
> SyntaxError: invalid predicate
My code is:
import xml.etree.ElementTree as ET
data = '''<root>
<child>
<p>aaa</p>
<p>bbb</p>
</child>
</root>'''
root = ET.fromstring(data)
p_element = root.findall(".//p[text()='aaa']")
print(p_element[0].text)
Running this code produces an invalid predicate error, but I believe it is correct. I'm using Python version 3.10.0, and running this on Windows.
It seems to have something to do with the text() part of the XPath; with that removed, it does not error.
答案1
得分: 2
.//p[text()='aaa'] 是一个完全有效的XPath表达式。
对于你的XML，如果你被困在使用ElementTree的情况下，可以尝试测试字符串值，.//p[.='aaa']，这将是一个解决方法。更好的方法是只使用一个如lxml这样更符合标准的XPath库。
另请参阅
英文:
.//p[text()='aaa'] is a perfectly valid XPath expression.
The problem is that ElementTree's implementation of XPath is incomplete.
For your XML, testing the string value, .//p[.='aaa'], would be a work-around if you're stuck with ElementTree. Better would be to only use an XPath library such as lxml that better follows the standard.
See also
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