Prevent multiple instances of threads for multiprocessing python

问题

I want to run a thread for sending email periodically. In the same program, I am creating processes to do another task. When I create the task, thread from original process is copied to these sub processes and I end up receiving multiple emails instead of one. How can I make sure that thread I run in main program is not copied to the sub processes that are created?

来源：https://stackoverflow.com/questions/19320756/prevent-multiple-instances-of-threads-for-multiprocessing-python