How to keeping environment variables on window split?

[Isaac Ge]

Please see this question: http://stackoverflow.com/questions/39642546/keeping-environment-variables-on-window-split

 and this: http://stackoverflow.com/questions/39642546/keeping-environment-variables-on-window-split#comment66633179_39652548

I want to the splited window inherit from my current active windows' python virtual environment variables.