subprocess.Popen - terminate

I am using subprocess.Popen to execute an executable, how can I
terminate that process when I want?

for example (on windows)

p = subprocess.Popen("calc.exe")
.....

now say I want to kill calc.exe ...how can I do it? By the way, I am
not looking for a windows only solution I need something that is
universal (mac, *nix, etc)

thanks

.

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