Safe process execution support in Python

[Sridhar R]

I like to execute programs from python.

.. not by using os.system .. bcoz ..

1. the process could easily eat up the CPU
2. the process could use signal system call to even kill all other
process of it's UID.
3. take more disk space, by writing big files
4. and lot more one could think of ..

I know about resource module in python.

Hope u understand my problem, is there any effective way to achieve
this?