Python Cmd class

Hi everyone, i’m new and i’m a python beginner developer. I’m using Cmd class to create a console. One command of that console is “start” that is a sort of scheduler that check every 5 minutes if there’s email to send. When i execute that command i would like to come back to main console and potetially execute another command without stop the other. Is there a way to do that? I try with thread but when I do “start” the process begin and work fine but I can’t come back to my console…
Thank you