Python中的Selenium找不到按鈕

Question

現在，我在Python中使用Selenium時遇到問題。 這是我第一次使用它，因此，如果我做某件事非常錯誤，請告訴我。 無論如何，我希望下面的腳本單擊網站上的按鈕。 看起來並不難，但是由於某種原因，它總是給我這個錯誤：

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)

這是我正在使用的代碼

##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 >>> ")

我出於隱私原因更改了我正在使用的網站，但據我所知，實際的XPath並不是問題。

（另外，請告訴我您是否以任何方式加快或提高腳本效率）。

Answer 1

您的XPath表達式不正確。 它們包含名稱空間“ x”（我不知道為什么要在表達式中放置此“ x”）。 因此，解決方案是從XPath表達式中刪除“ x”。 見下文：

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