Python 如何消除硒中的特定异常？

我必须在我的项目中使用selenium。当我使用selenium时，我会在每一步都这样做

   time.sleep(6)

我为加载特定页面提供了足够的时间间隔，但在某些情况下仍然面临以下错误。 大多数情况下，我得到的例外情况如下

常规例外情况：

   Exception: Message: u'Unable to locate element:   {"method":"xpath","selector":"//textarea[@style=\\"overflow-y: hidden; height: 50px; width:  300px;\\"]"}' ; Stacktrace: Method WebDriverError threw an error in    file:///tmp/tmpBxGp2P/extensions/fxdriver@googlecode.com/resource/modules/atoms.js 
   Traceback (most recent call last):
    File "crawl_optimize.py", line 206, in main
     word_query = browser.find_element_by_xpath('//textarea[@style="overflow-y: hidden; height: 50px; width: 300px;"]')
    File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 210, in find_element_by_xpath
     return self.find_element(by=By.XPATH, value=xpath)
    File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 643, in find_element
    {'using': by, 'value': value})['value']
   File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 153, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/errorhandler.py", l     ine 147, in check_response
     raise exception_class(message, screen, stacktrace)

由于WebDriverWait（），我也没有收到这样的实现错误。直到（）：

如何消除此类异常？

可能有两种方法

您的元素尚未在分配的6秒内完成加载

您的定位器格式不正确。这看起来很可疑

{“方法”：“xpath”，“选择器”：”//textarea[@style=\“溢出-y:隐藏；高度：50px；宽度：300px；\“]”}

您能否使用FireFinder或类似工具检查定位器是否返回您期望的结果

如果定位器正常，您可以尝试使用WebDriverWait&ExpectedCondition确认页面已完成加载，而不是打赌页面将始终在6秒内加载

    NoSuchElementException: Message: u'Unable to locate element: {  "method":"xpath","selector":"//textarea[@style=\\"overflow-y: hidden; height: 50px; width: 300px;\\"]"}' ; Stacktrace: Method WebDriverError threw an error in   file:///tmp/tmpBxGp2P/extensions/fxdriver@googlecode.com/resource/modules/atoms.js 
  keyword : balance transfer ad pos : 2
  Exception: Message: None 
  Traceback (most recent call last):
    File "crawl_optimize.py", line 228, in main
     start_cpc,end_cpc = set_initial_cpc(initial_max_cpc,ad_position)
    File "crawl_optimize.py", line 95, in set_initial_cpc
    ep = crawl_position(cost)
   File "crawl_optimize.py", line 82, in crawl_position
    WebDriverWait(browser, 10).until(lambda driver :   driver.find_element_by_link_text(word.lower()))
   File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/support/wait.py", line 55, in until
    raise TimeoutException()
    TimeoutException: Message: None