【python】报错lxml.etree.XPathEvalError: Invalid expression

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于 2020-10-18 20:43:53 首次发布

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在执行Python爬虫时遇到了`lxml.etree.XPathEvalError: Invalid expression`的错误，该错误出现在尝试使用XPath表达式解析HTML内容时。错误位于文件`hello_spider.py`的第6行，通过`ht.xpath(xpath)`执行。要解决这个问题，需要检查XPath表达式是否正确，并确保它符合XPath语法。

报错信息：
Traceback (most recent call last):
File “c:\Users\86130\Desktop\Study\python\spider_learning\hello_spider.py”, line 6, in
text = ht.xpath(xpath)
File “src\lxml\etree.pyx”, line 1583, in lxml.etree._Element.xpath
File “src\lxml\xpath.pxi”, line 305, in lxml.etree.XPathElementEvaluator.call
File “src\lxml\xpath.pxi”, line 225, in lxml.etree._XPathEvaluatorBase._handle_result
lxml.etree.XPathEvalError: Invalid expression

源代码：

import lxml.html,requests
url = 'https://www.python.org/dev/peps/pep-0020/'
xpath = '//*[@id="the-zen-of-python"]/pre/text（）'
response = requests.get(url)
ht = lxml.html.fromstring(response.text)
text = ht.xpath(xpath)
print('hello，\n'+' '.join(text))