How to run a python script on server X times simultaneously?

I have seen a ton of people asking how to run python blocking code blocks synchronously. However, everyone is giving different answers of what to do. What is arguably the best way to run a function (one with blocking code) many times simultaneously in python? Additionally, if it is on a server rather than just a local computer. I am also using Selenium, so it will be opening up a chrome.exe every time it is ran.