python+selenium之——错误：selenium.common.exceptions.WebDriverException: Message: ‘geckodriver’ executable needs to be in PATH.

此时，需要自己配置geckodriver

1. 下载geckodriver，地址：https://github.com/mozilla/geckodriver/releases
2. 下载后解压得到geckodriver.exe
3. 将geckodriver.exe放到Firefox的安装目录下
4. 将火狐安装目录添加到环境变量path中
5. 重启IDLE