我在各种 xpath 表达式中都遇到过这个问题。 selenium 的 find_element_by_xpath() 方法失败，而同一表达式的 lxml 给出了预期值。例如:
>>> lxml.html.fromstring(br.page_source).xpath('//a[@title="2"]/text()')
... ['\n\t\t\t\t\t\t2\n\t\t\t\t\t', '\n\t\t\t\t\t\t2\n\t\t\t\t\t']
>>> br.find_element_by_xpath('//a[@title="2"]/text()')
... InvalidSelectorException: Message: {"errorMessage":"The result of the xpath expression \"//a[@title=\"2\"]/text()\" is: [object Text]. It should be an element.","request":{"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"108","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:47455","User-Agent":"Python-urllib/2.7"},"httpVersion":"1.1","method":"POST","post":"{\"using\": \"xpath\", \"sessionId\": \"85546b60-7c8e-11e4-b2ba-2bb5fbee7719\", \"value\": \"//a[@title=\\\"2\\\"]/text()\"}","url":"/element","urlParsed":{"anchor":"","query":"","file":"element","directory":"/","path":"/element","relative":"/element","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/element","queryKey":{},"chunks":["element"]},"urlOriginal":"/session/85546b60-7c8e-11e4-b2ba-2bb5fbee7719/element"}}
Screenshot: available via screen
为什么会发生这种情况以及如何纠正它？
最佳答案
正如错误消息所述 - find_element_by_xpath() 内部使用的 xpath 必须指向一个元素。在您的情况下，它指向一个文本节点。
如果要获取元素的文本，先找到元素，然后获取.text:
element = driver.find_element_by_xpath('//a[@title="2"]')
print element.text
关于python - selenium 通过 xpath 查找元素出现错误，其中 lxml 中的相同表达式可以，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27318917/