一、Selenium_Firefox-chrome-IE 异常问题
在运行Selenium webdriver的示例时：
发生如下几种错误：
selenium.common.exceptions.WebDriverException: Message: 'geckodriver' executable needs to be in PATH.selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home
selenium.common.exceptions.WebDriverException: Message: 'IEDriverServer.exe' executable needs to be in PATH. Please download from http://selenium-release.storage.googleapis.com/index.html and read up at https://github.com/SeleniumHQ/selenium/wiki/InternetExplorerDriver二、Selenium_Firefox-chrome-IE 异常解决办法
在网上找了下几种方式，最终按照如下方式解决：
点击打开链接 https://github.com/mozilla/geckodriver/releases
在如上链接中寻找适合当前系统的驱动，然后放入python目录下的Scripts目录下即可；
如果用的是Anaconda ，则放在Anaconda目录下的Scripts目录下即可；
完成如上操作后就OK了.