Message: 'geckodriver' executable needs to be in PATH. 解决方法

问题描述：

执行如下代码

# coding=utf-8
from selenium import webdriver

driver = webdriver.Firefox()
driver.maximize_window()
driver.implicitly_wait(2)

driver.get('https://www.baidu.com')
try:
    driver.find_element_by_id('kw')
    print('test pass: ID found')
except Exception as e:
    print('Exception found', format(e))

driver.quit()

提示报错：

Traceback (most recent call last):
File "E:/PythonSelenium/CSDN/004id.py", line 4, in <module>
driver = webdriver.Firefox()
File "E:\Python35\lib\site-packages\selenium\webdriver\firefox\webdriver.py", line 142, in __init__
self.service.start()
File "E:\Python35\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.

原因分析：

摘取主要报错信息 Message: 'geckodriver' executable needs to be in PATH.

解决方法：

（1）测试环境：Selenium 3.4.0   Firefox 56.0   Python3.5.2

（2）下载火狐浏览器对应驱动，传送门 https://github.com/mozilla/geckodriver/releases   结合我浏览器的版本需要下载V 0.19.0

（3）解压文件获取geckodriver.exe文件，并放置在主目录下。重新运行后发现问题已解决。

注：注意火狐浏览器、Python环境变量设置。