sys：macOS Big Sur 版本 11.2.3
python: 3.8.5
selenium: 3.141.0
Chrome: 版本 90.0.4430.72（正式版本） (x86_64)
Firefox: 87.0 (64 位)
chromedriver: ChromeDriver 90.0.4430.24 (4c6d850f087da467d926e8eddb76550aed655991-refs/branch-heads/4430@{#429})
geckodriver 0.29.1 (970ef713fe58 2021-04-08 23:34 +0200)
最近初看selenium，在python上进行自动化测试，就卡在启动上，第一个demo就测不过去
pip安装了selenium，也下载了chromedriver和geckodriver，也按照官网的要求把driver都放在了/usr/local/bin/目录下
然后把下面代码存入文件test.py
from selenium import webdriver
browser = webdriver.Firefox()
browser.get('http://baidu.com')
然后执行 python test.py，不论使用webdriver.Chrome()还是webdriver.Firefox()，以及在这个函数里面放置各种参数，最终都会报如下错误：
Traceback (most recent call last):
File "pro/web_scraping/test2.py", line 3, in <module>
browser = webdriver.Firefox()
File "/Users/xxx/.local/lib/python3.8/site-packages/selenium/webdriver/firefox/webdriver.py", line 164, in __init__
self.service.start()
File "/Users/xxx/.local/lib/python3.8/site-packages/selenium/webdriver/common/service.py", line 104, in start
raise WebDriverException("Can not connect to the Service %s" % self.path)
selenium.common.exceptions.WebDriverException: Message: Can not connect to the Service geckodriver
试过各种方法，找个各种解决方案，内网外网都翻了许多答案，都没有解决问题
今天甚至我nodejs都做了个demo去测试，然后成功了。然后就更蛋疼了。。。
今天看到这个帖子，豁然开朗
ping localhost，然后没ping通
(base2) ➜ ~ ping localhost ping: cannot resolve localhost: Unknown host (base2) ➜ ~ ping localhost ping: cannot resolve localhost: Unknown host (base2) ➜ ~ ping localhost ping: cannot resolve localhost: Unknown host (base2) ➜ ~ ping localhost ping: cannot resolve localhost: Unknown hosts
甚至不死心，还多试了几次，在配置了hosts之后，再ping了一次通了，发现能吊起来Chrome和Firefox了，Cool
再次运行python test.py
因为使用hosts，推荐个软件：https://apps.apple.com/cn/app/helm-hosts-%E6%96%87%E4%BB%B6%E7%AE%A1%E7%90%86/id1099472017?ign-mpt=uo%3D8&mt=12
参考文章：
https://blog.csdn.net/Excaliburrr/article/details/79164163
https://www.zhihu.com/question/19608612
https://stackoverflow.com/questions/50727595/selenium-common-exceptions-webdriverexception-message-can-not-connect-to-the-s