Finally I got it.
没有自动化过edge，今天被小坑了一下，但是还好现在弄好了。
- 查看edge 版本，我的是14.14393
- https://developer.microsoft.com/en-us/microsoft-edge/tools/webdriver/ 下载edge driver。一定要下载support version的driver哦，否则你单独运行webdriver就会提示你这个版本不匹配。
C:Users***Downloads>MicrosoftWebDriver.exe
This version of MicrosoftWebDriver.exe is not compatible with the installed version of Windows 10.
For more information, visit http://aka.ms/webdriver
直接跑test报的错我也贴过来，免的有人跟我一样，他说检测assert_process_still_running 有问题，其实还是driver不匹配~ 大家要注意哦~
ft1.1: <subprocess.Popen object at 0x03A188F0>
<subprocess.Popen object at 0x03A188F0>
Traceback (most recent call last):
File "C:Users*Desktopfirst_webdriver.py", line 15, in setUp
self.driver = webdriver.Edge("c:/users//downloads/MicrosoftWebDriver.exe")
File "C:Python27libsite-packagesseleniumwebdriveredgewebdriver.py", line 34, in init
self.edge_service.start()
File "C:Python27libsite-packagesseleniumwebdrivercommonservice.py", line 96, in start
self.assert_process_still_running()
File "C:Python27libsite-packagesseleniumwebdrivercommonservice.py", line 110, in assert_process_still_running
% (self.path, return_code)
WebDriverException: Message: Service c:/users/**/downloads/MicrosoftWebDriver.exe unexpectedly exited. Status code was: 1