How can I launch an instance of an application using Python?

Question

I am creating a Python script where it does a bunch of tasks and one of those tasks is to launch and open an instance of Excel. What is the ideal way of accomplishing that i

Answer 1

or

os.system("start excel.exe ")

(presuming it's in the path, and you're on windows)

and also on Windows, just start works, too - if it's an associated extension already (as xls would be)