Python中的Selenium找不到按钮

Question

现在，我在Python中使用Selenium时遇到问题。 这是我第一次使用它，因此，如果我做某件事非常错误，请告诉我。 无论如何，我希望下面的脚本单击网站上的按钮。 看起来并不难，但是由于某种原因，它总是给我这个错误：

selenium.common.exceptions.InvalidSelectorException was unhandled by user code
Message: Message: The given selector id('panel1-7')/x:div[1]/x:button is either invalid or does not result in a WebElement. The following error occurred:
InvalidSelectorError: Unable to locate an element with the xpath expression id('panel1-7')/x:div[1]/x:button because of the following error:
NamespaceError: An attempt was made to create or change an object in a way which is incorrect with regard to namespaces
Stacktrace:
    at FirefoxDriver.annotateInvalidSelectorError_ (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/driver-component.js:10744)
    at FirefoxDriver.prototype.findElementInternal_ (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/driver-component.js:10775)
    at FirefoxDriver.prototype.findElement (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/driver-component.js:10779)
    at DelayedCommand.prototype.executeInternal_/h (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/command-processor.js:12661)
    at DelayedCommand.prototype.executeInternal_ (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/command-processor.js:12666)
    at DelayedCommand.prototype.execute/< (file:///C:/Users/USER/AppData/Local/Temp/tmpd47h5z77/extensions/fxdriver@googlecode.com/components/command-processor.js:12608)

这是我正在使用的代码

##Import Modules
##
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
import unittest
import time

##Initialize and Define Variables
##
driver = webdriver.Firefox()
##Open up webpage
driver.get("http://PretendThisIsTheTargetWebsitePlease.com")
RedButtonXpath = "id('panel1-7')/x:div[1]/x:button"
BlackButtonXpath = "id('panel8-14')/x:div[1]/x:button"
GreenButtonXpath = "id('panel0-0')/x:div[1]/x:button"
RedButtonFieldElement = WebDriverWait(driver, 2).until(lambda driver: driver.find_element_by_xpath(RedButtonXpath))
BlackButtonFieldElement = WebDriverWait(driver, 2).until(lambda driver: driver.find_element_by_xpath(BlackButtonXpath))
GreenButtonFieldElement = WebDriverWait(driver, 2).until(lambda driver: driver.find_element_by_xpath(GreenButtonXpath))

##Main Loop
##
input = input("Generic answer here please! :D >>> ")

我出于隐私原因更改了我正在使用的网站，但据我所知，实际的XPath并不是问题。

（另外，请告诉我您是否以任何方式加快或提高脚本效率）。

Answer 1

您的XPath表达式不正确。 它们包含名称空间“ x”（我不知道为什么要在表达式中放置此“ x”）。 因此，解决方案是从XPath表达式中删除“ x”。 见下文：

RedButtonXpath = "id('panel1-7')/div[1]/button"
BlackButtonXpath = "id('panel8-14')/div[1]/button"
GreenButtonXpath = "id('panel0-0')/div[1]/button"