1、启动不了浏览器，报错如下：
============================= ERRORS =============================
Traceback (most recent call last):
File "D:\python_files\eclipse_wrokstation\WinshareWebAotuTest\TestCase\testBookComments.py", line 16, in setUp
self.driver = webdriver.Chrome()
File "D:\Program Files\Python\Python3\lib\site-packages\selenium\webdriver\chrome\webdriver.py", line 75, in __init__
desired_capabilities=desired_capabilities)
File "D:\Program Files\Python\Python3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 154, in __init__
self.start_session(desired_capabilities, browser_profile)
File "D:\Program Files\Python\Python3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 243, in start_session
response = self.execute(Command.NEW_SESSION, parameters)
File "D:\Program Files\Python\Python3\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 312, in execute
self.error_handler.check_response(response)
File "D:\Program Files\Python\Python3\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: unrecognized Blink revision: a10b9cedb40738cb152f8148ddab4891df876959
(Driver info: chromedriver=2.10.267521,platform=Windows NT 6.3 x86_64)
解决方式：
webdriver初始化的时候，指定一下浏览器的所在路径
在声明webdriver的时候加一句，再运行就可以了：
path = "C:\Program Files (x86)\Google\Chrome\Application\chromedriver.exe"
self.driver = webdriver.Chrome(executable_path=path)
2、根据定位找不到元素：
（1）可能情况一：因为当前浏览器的窗口切换了（新跳转了窗口）。
解决方法：在定位之前，先切换一下窗口
handles = driver.window_handles # 所有窗口
print '*'*20,handles
for handle in handles:
if handle!=driver.current_window_handle:
print 'switch to ',handle
driver.switch_to_window(handle)
print driver.current_window_handle # 打印窗口句柄 --名称
break
（2）可能情况二：因为当前定位的iframe变了。
解决方法：在定位之前，先切换一下frame
driver.switch_to_frame("rightFrame")
（3）可能情况三：运行太快，页面还未完全加载。
解决方法：在定位之前，先休眠1秒（或者多秒）
time.sleep(1)