selenium：selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH.

可用链接：

1.http://blog.csdn.net/heatdeath/article/details/71136174

2.https://www.cnblogs.com/yousuosiyss/p/6882420.html?utm_source=itdadao&utm_medium=referral