经过两次迭代后，它失败并显示错误。
如果发生这种情况是因为没有通过Selenium ide找到xpath，那么为什么它在循环的第二次迭代中不会失败。
如何获得输出而没有任何错误并一一命中所有8个Urls，无论xpath是否可用。
这是我的代码：
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
#base Url
baseurl="http://www.incredibleindia.org"
driver = webdriver.Firefox()
driver.implicitly_wait(2)
driver.get(baseurl)
driver.implicitly_wait(2)
main_links_tabs=driver.find_elements_by_xpath("html/body/div[3]/div/div[1]/div[2]/ul/li/a")
all_tablength=len(main_links_tabs)
print all_tablength
main_link_list=[]
for i in range(all_tablength):
driver.implicitly_wait(3)
links=main_links_tabs[i].get_attribute('href')
main_link_list.append(links)
#all main_tab_link hit one by one
for i in main_link_list:
print i
driver.implicitly_wait(30)
driver.get(i)
#travel tabs data
print "tabl links hit one by one"
travel_tabs_sublinks=driver.find_elements_by_xpath(".//*[@id='left-inner-content']/div[2]/div/ul/li/a")
travel_tabs_sublinks_len=len(travel_tabs_sublinks)
print travel_tabs_sublinks_len
输出：
8
http://www.incredibleindia.org/en/travel
tabl links hit one by one
http://www.incredibleindia.org/en/trade
tabl links hit one by one
http://www.incredibleindia.org/en/#media
tabl links hit one by one
Traceback (most recent call last):
File "incredibleindia.py", line 27, in <module>
travel_tabs_sublinks=driver.find_elements_by_xpath(".//*[@id='left- inner-content']/div[2]/div/ul/li/a")
File "/usr/local/lib/python2.7/dist- packages/selenium/webdriver/remote/webdriver.py", line 244, in find_elements_by_xpath
return self.find_elements(by=By.XPATH, value=xpath)
File "/usr/local/lib/python2.7/dist- packages/selenium/webdriver/remote/webdriver.py", line 679, in find_elements
{'using': by, 'value': value})['value']
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.InvalidSelectorException: Message: The given selector .//*[@id='left-inner-content']/div[2]/div/ul/li/a 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='left-inner-content']/div[2]/div/ul/li/a because of the following error:
TypeError: Argument 1 of Document.createNSResolver is not an object.
Stacktrace:
at FirefoxDriver.annotateInvalidSelectorError_ (file:///tmp/tmpDolyM9/extensions/[email protected]/components/driver-component.js:10245)
at FirefoxDriver.prototype.findElementsInternal_ (file:///tmp/tmpDolyM9/extensions/[email protected]/components/driver-component.js:10303)
at fxdriver.Timer.prototype.setTimeout/<.notify (file:///tmp/tmpDolyM9/extensions/[email protected]/components/driver-component.js:603)
最佳答案
首先，您没有正确使用implicitly_wait()。它不仅会休眠N秒钟，而且实际上会立即执行-表示驱动程序每次搜索元素要等待多少时间：
隐式等待是告诉WebDriver对DOM进行轮询
尝试查找一个或多个元素（如果存在）时的时间量
暂时不可用。默认设置为0。设置后，
在WebDriver对象实例的生存期内设置了隐式等待。
相反，您需要使用Explicit Waits。这是代码的改进的工作版本：
from selenium import webdriver
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
url = "http://www.incredibleindia.org"
driver = webdriver.Firefox()
driver.get(url)
# wait for menu to being loaded
WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div.menu li > a")))
links = [a.get_attribute('href') for a in driver.find_elements_by_css_selector('div.menu li > a')]
for link in links:
driver.get(link)
# wait for menu to being loaded
try:
WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.CSS_SELECTOR, "div#left-inner-content li > a")))
except TimeoutException:
print driver.title, "No sublinks"
sublinks = driver.find_elements_by_css_selector("div#left-inner-content li > a")
print driver.title, [sublink.text for sublink in sublinks]
印刷品：
Incredible India - Travel [u'Rural Tourism', u'Mountain Trains & Luxury Trains', u'Eco Tourism', u'MICE', u'All Destinations']
Incredible India - Trade No sublinks
...
关于python - 使用 Selenium ide和python在xpath循环两次迭代后，我的程序失败，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29026021/