腳本：（打開火狐瀏覽器，進入百度網頁，搜索selenium）

from selenium import webdriver

browser = webdriver.Firefox();
browser.get("http://www.baidu.com");
browser.find_element_by_id("kw").send_keys("selenium");
browser.find_element_by_id("su").click();
browser.quit();

執行腳本報錯1：

Traceback (most recent call last):
  File 
 
"D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\common\service.py", line 74, in start
    stdout=self.log_file, stderr=self.log_file)
  File "D:\2017\programming language\python\installPath\lib\subprocess.py", line 707, in __init__
    restore_signals, start_new_session)
  File 
 
"D:\2017\programming language\python\installPath\lib\subprocess.py", line 990, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] 系統找不到指定的文件。

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\2017\programming language\python\installPath\Scripts\baidu.py
 
", line 3, in <module>
    browser = webdriver.Firefox();
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 142, in __init__
    self.service.start()
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\common\service.py", line 81, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: ‘geckodriver‘ executable needs to be in PATH. 

 這裏提到geckodriver驅動，selenium3.x中，firefox瀏覽器驅動獨立，需要單獨安裝；
解決方法：下載geckodriver驅動，將其放入python安裝路徑中，確保path中已添加該路徑；

再次執行腳本，報錯2：

Traceback (most recent call last):
  File "D:\2017\programming language\python\installPath\Scripts\baidu.py", line 3, in <module>
    browser = webdriver.Firefox();
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 152, in __init__
    keep_alive=True)
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 98, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 188, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 256, in execute
    self.error_handler.check_response(response)
  File "D:\2017\programming language\python\installPath\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to find a matching set of capabilities

解決方法：

1. 檢查本機java版本，selenium3.x只支持java8版本以上，這裏符合要求；

2. geckodriver版本是v0.16.1 ，firefox瀏覽器版本是45，卸載firefox，安裝最新版本的firefox版本53；

運行腳本，可以正常執行。

python3.6.1+selenium3.0環境安裝問題及解決方法