Selenium_webdriver对 chrome driver的调用

今天在使用selenium +webdriver打开chrome，代码如下：

from selenium import webdriver

driver=webdriver.Chrome()

driver.get("www.google.com")

运行代码后会出现如下错误：

Traceback (most recent call last):
  File "/Selenium_Python/selenium_python/forward_url.py", line 7, in
    driver=webdriver.Chrome()
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/webdriver.py", line 60, in __init__
    self.service.start()
  File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/service.py", line 68, in start
    and read up at http://code.google.com/p/selenium/wiki/ChromeDriver")
selenium.common.exceptions.WebDriverException: Message: 'ChromeDriver executable needs to be available in the path.                 Please download from http://code.google.com/p/selenium/downloads/list                and read up at http://code.google.com/p/selenium/wiki/ChromeDriver' 

提示chrome driver没有放置在正确的路径下，于是下载chrome dirver，然后放置到/usr/bin的目录下，再次运行就OK了！

OS	Expected Location of Chrome
Linux	/usr/bin/google-chrome1
Mac	/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome
Windows XP	%HOMEPATH%\Local Settings\Application Data\Google\Chrome\Application\chrome.exe
Windows Vista	C:\Users\%USERNAME%\AppData\Local\Google\Chrome\Application\chrome.exe

这张表说明google-chrome在ubuntu 下要放置在/usr/bin的目录下