Because no-one needed it before and I didn't think it would be very
useful. After all you can also run a script using the nice(1)
command. And, I don't believe this is part of the POSIX standard.
If you want it you can add it to posixmodule.c with only a few lines.
If enough people want it I can add it to 0.9.8.
--Guido van Rossum, CWI, Amsterdam <email@example.com>
"Well there's spam, egg, sausage and spam. That's not got *much* spam