系统环境 mac python3.6

pip instal selenium #安装selenium模块，默认是最新的ye可以pip instal selenium==版本号

brew install geckodriver #下载安装geckodriver

或者直接去selenium官网下载https://github.com/mozilla/geckodriver/releases

geckodriver-v0.20.0-macos.tar.gz解压到指定目录，或者配置到python环境中/usr/local/bin。

Firefox浏览器版本59.0.2

报错

elenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH，是因为geckodriver的没有在环境变量中识别到

报错

selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities是因为浏览器的版本和驱动的版本不一致

测试一下

#!/usr/bin/env python

# -*- coding: UTF-8 -*-

from selenium import webdriver

import time

#driver = webdriver.Firefox(executable_path="/usr/local/bin/geckodriver")

driver = webdriver.Firefox(executable_path="/Users/wang/Downloads/geckodriver")

driver.get("http://www.baidu.com")

driver.find_element_by_id("kw").send_keys("测试")

driver.find_element_by_id("su").click()

time.sleep(30)

driver.quit()

ok