从Django项目启动多个Django开发服务器

I'm writing a web based code editor for Django projects. From within the editor I want to start the Django runserver command without it interfering with the server for the editor itself. Below is the code I use. The server (port 9999) is started but when I make a change to the code for the project whose server I just started both servers stop. The error is "That port is already in use"I'm writing a web based code editor for Django