&引用；元素未附加到页面文档"；使用selenium和python时出错

我想在5个不同的文件中打印5个不同选项的值，因此我一直在尝试使用以下代码：

driver=webdriver.Chrome()
driver.get('url');
time.sleep(3)


ele=driver.find_element_by_id("reportDate")
ele.clear()
ele.send_keys("21-Nov-2015")


currency = driver.find_element_by_xpath("//*[@id='currencyCode']")
options = currency.find_elements_by_tag_name("option")
optionsList = []

for option in options: #iterate over the options, place the attribute value in list
 optionsList.append(option.get_attribute("value"))
 for optionValue in optionsList:
  print "starting loop on option %s" % optionValue
  driver.execute_script("document.getElementById('currencyCode').style.display = 'block';")
  driver.find_element_by_xpath("//*[@id='currencyCode']/option[@value='"+optionValue+"']").click()


  driver.find_element_by_css_selector('input[type=\"submit"]').click()
  time.sleep(5)


  infile="ice."+optionValue+"."+x+".txt"
  with open(infile,"w") as ice_content:
   data=[]
   for tr in driver.find_elements_by_xpath('//table[@class="table table-responsive table-data"]//tr'):
    tds=tr.find_elements_by_tag_name('td')
    if tds:
     data=([td.text for td in tds])
     ice_content.write(str("|".join(data))+"\n")

打印第一个文本文件后，它向我抛出错误：

raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.StaleElementReferenceException: Message: stale element reference: element is not attached to the page document

以下是html代码段：

<label for="currencyCode">Currency</label>
<select id="currencyCode" name="criteria.currencyCode" class="form-control" style="display: none;">
                <option value="CHF">CHF</option>
                <option value="EUR">EUR</option>
                <option value="GBP">GBP</option>
                <option value="JPY">JPY</option>
                <option value="USD">USD</option>
            </select>
<div class="chosen-container chosen-container-single chosen-container-single-nosearch" style="width: 297px;" title="" id="currencyCode_chosen">

货币
瑞士法郎
欧元
英镑
日元
美元

---

一定要告诉我哪里出了问题，提前谢谢

您不需要通过xpath查找

currencyCode

对象，您可以像以前一样通过ID查找

currency=driver。通过ID（“currencyCode”）查找元素

您能否至少给出一个发生断言的行号，因为有几个地方可能会引发异常。
很抱歉，但我似乎无法从上面的URL找到解决方案。要找到解决方案，我必须在第二个for循环之前打开文本文件。这给了我答案
driver=webdriver.Chrome()
driver.get('url');
time.sleep(3)


ele=driver.find_element_by_id("reportDate")
ele.clear()
ele.send_keys("21-Nov-2015")


currency = driver.find_element_by_xpath("//*[@id='currencyCode']")
options = currency.find_elements_by_tag_name("option")
optionsList = []

for option in options: #iterate over the options, place the attribute value in list
 optionsList.append(option.get_attribute("value"))
for optionValue in optionsList:
  print "starting loop on option %s" % optionValue
  infile="ice."+optionValue+"."+x+".txt"
  with open(infile,"w") as ice_content:
   driver.execute_script("document.getElementById('currencyCode').style.display = 'block';")
   driver.find_element_by_xpath("//*[@id='currencyCode']/option[@value='"+optionValue+"']").click()


   driver.find_element_by_css_selector('input[type=\"submit"]').click()
   time.sleep(5)

   data=[]
   for tr in driver.find_elements_by_xpath('//table[@class="table table-responsive table-data"]//tr'):
     tds=tr.find_elements_by_tag_name('td')
     if tds:
      data=([td.text for td in tds])
      ice_content.write(str("|".join(data))+"\n")