如果将Windows PATH设置为C:\Users\YourUserName\Downloads\selenium_driver似乎无效（以便selenium可以找到geckdriver.exe），则可以在Python脚本中指定其目录，如下所示：
from selenium import webdriver
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
gecko = r'C:\Users\YourUserName\Downloads\selenium_driver\geckodriver.exe'
ffox_binary = FirefoxBinary(r'C:\Program Files\Mozilla FirefoxESR\firefox.exe') #for 64 bit installation
#ffox_binary = FirefoxBinary(r'C:\Program Files (x86)\Mozilla FirefoxESR\firefox.exe') #for 32 bit installation
browser = webdriver.Firefox(firefox_binary=ffox_binary, executable_path=gecko)
browser.get('http://localhost:8000')
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