When performing multiprocessing or subprocessing, sometimes you need to kill that script, and fast. You can use task manager to do this, but that's too many clicks.
There is a great window's program called taskkill.exe. To do this process, you need to create a link. Once you have the link, enter in the following command: 'C:\Windows\System32\taskkill.exe /F /IM python.exe /T'
All processes will end quickly.