python3.6+selenium3.0打开浏览器报错问题

from selenium import webdriver

browser = webdriver.Firefox()
browser.get('http://www.baidu.com')

报错为：

C:\Users\AppData\Local\Programs\Python\Python36\python.exe D:/Python/hello.py
Traceback (most recent call last):
  File "C:\Users\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\common\service.py", line 76, in start
    stdin=PIPE)
  File "C:\Users\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "C:\Users\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 997, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] 系统找不到指定的文件。

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:/Python/hello.py", line 3, in <module>
    browser = webdriver.Firefox()
  File "C:\Users\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 152, in __init__
    self.service.start()
  File "C:\Users\AppData\Local\Programs\Python\Python36\lib\site-packages\selenium\webdriver\common\service.py", line 83, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH. 


Process finished with exit code 1

 这里提到geckodriver驱动，selenium3.x中，firefox浏览器驱动独立，需要单独安装；
解决方法：下载geckodriver驱动，将其放入python安装路径中，确保path中已添加该路径；

下载geckodriver驱动的地址为：https://github.com/mozilla/geckodriver/releases

放置的位置：

• Windows： python安装根目录（与python.exe 同一目录）

• Mac: /user/local/bin

重新运行程序，已成功打开浏览器