macOS配置selenium

1.选择chromedriver

1. selenium之 chromedriver与chrome版本映射表
   http://blog.csdn.net/huilan_same/article/details/51896672
2. chromedriver下载链接
   http://chromedriver.storage.googleapis.com/index.html

二、chromedriver环境配置
chromedriver文件放在“/usr/local/bin”目录下
运行以下测试代码

from selenium import webdriver

driver = webdriver.Chrome()
base_url = 'https://www.baidu.com'
driver.get(base_url)