当xpath在使用selenium和python的页面上不可用时不引发异常？

如果xpath在页面上不可用，那么它应该抛出异常，但它会导致整个程序出错

我已经使用selenium加载了完整的页面，然后我尝试单击所有的“阅读更多”链接，但不起作用

页面链接

示例代码

xpath_content=".//*[@id='reviews-container']/div[1]/div[3]/div[1]/div/div/div[3]/div/div[1]/div[2]/div/span"
temp="true"
while temp:
    try:
        WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.XPATH,xpath_content))) 
        urls=driver.find_element_by_xpath(xpath_content)
        text=urls.text
        if text:
            temp=text  
        print "XPATH read_more=",temp
        driver.find_element_by_xpath(xpath_content).click()
    except TimeoutException:
        print driver.title, "no Read more review"
        temp=""

xpath_content=".//*[@id='reviews-container']/div[1]/div[3]/div[1]/div/div/div[3]/div/div[1]/div[2]/div/span" 
try:
     WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.XPATH,xpath_content))) 
    driver.execute_script('$("span.read-more").click();') 
except TimeoutException:
    print driver.title, "no Read more review"

出现错误

 File "zomato_delhi.py", line 31, in read_more_content
driver.find_element_by_xpath(xpath_content).click()
 File "/usr/local/lib/python2.7/dist- packages/selenium/webdriver/remote/webelement.py", line 65, in click
self._execute(Command.CLICK_ELEMENT)
File "/usr/local/lib/python2.7/dist- packages/selenium/webdriver/remote/webelement.py", line 402, in _execute
return self._parent.execute(command, params)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 175, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 166, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.ElementNotVisibleException: Message: Element is not currently visible and so may not be interacted with
Stacktrace:
at fxdriver.preconditions.visible (file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command-processor.js:9587)
at DelayedCommand.prototype.checkPreconditions_ (file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command-processor.js:12257)
at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command-processor.js:12274)
at DelayedCommand.prototype.executeInternal_ (file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command-processor.js:12279)
at DelayedCommand.prototype.execute/< (file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command-processor.js:12221)

文件“zomato\u drih.py”，第31行，阅读更多内容
驱动程序。通过xpath（xpath内容）查找元素。单击（）
文件“/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py”，第65行，单击
self.\u执行（命令。单击\u元素）
文件“/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webelement.py”，第402行，在
返回self.\u parent.execute（命令，参数）
文件“/usr/local/lib/python2.7/dist packages/selenium/webdriver/remote/webdriver.py”，执行中的第175行
self.error\u handler.check\u响应（响应）
文件“/usr/local/lib/python2.7/dist packages/selenium/webdriver/remote/errorhandler.py”，第166行，在check_响应中
引发异常类（消息、屏幕、堆栈跟踪）
selenium.common.exceptions.ElementNotVisibleException:消息：元素当前不可见，因此可能无法与之交互
堆栈跟踪：
在fxdriver.premissions.visible(file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command processor.js:9587）
在DelayedCommand.prototype.CheckPremissions\u(file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command processor.js:12257）
在DelayedCommand.prototype.executeInternal\uh处(file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command processor.js:12274）
在DelayedCommand.prototype.executeInternal\u(file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command processor.js:12279）
在DelayedCommand.prototype.execute/<(file:///tmp/tmpKtHaW3/extensions/fxdriver@googlecode.com/components/command processor.js:12221）

删除while循环

---

它在删除While循环后工作

我只能对XPath表达式进行注释，而不能对Selenium代码进行注释。你的表情太复杂了，为什么不干脆用

//span[@class = "read-more"]

确定正确的跨度元素？例如，在Firefox或Chrome的Web控制台中，使用

$x('//span[@class = "read-more"]')

你可以试着替换

WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.XPATH, xpath_content))) 

与

---

这对我很有效

xpath_content=".//*[@id='reviews-container']/div[1]/div[3]/div[1]/div/div/div[3]/div/div[1]/div[2]/div/span"
temp="true"
while temp:
    try:
        WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.XPATH,xpath_content))) 
        urls=driver.find_element_by_xpath(xpath_content)
        text=urls.text
        if text:
            temp=text  
        print "XPATH read_more=",temp
        driver.find_element_by_xpath(xpath_content).click()
    except TimeoutException:
        print driver.title, "no Read more review"
        temp=""

xpath_content=".//*[@id='reviews-container']/div[1]/div[3]/div[1]/div/div/div[3]/div/div[1]/div[2]/div/span" 
try:
     WebDriverWait(driver, 20).until(EC.presence_of_element_located((By.XPATH,xpath_content))) 
    driver.execute_script('$("span.read-more").click();') 
except TimeoutException:
    print driver.title, "no Read more review"

不需要任何循环

driver.execute_脚本（'$（“span.read more”）。单击（）；'）

---

它将单击页面上的所有“阅读更多”链接。

否，这不会改变任何内容。它不会给我任何错误，但没有单击页面上的所有“阅读更多”链接page@user3902208：可能是因为xpath表达式中的错误？但问题是错误，不是吗？