That isn't really the "python process library", most of it is an agglomeration of thin wrappers around standard POSIX interfaces.
The subprocess[0] module is probably closer to what you're looking for, though it still does not operate the way you want it to. It's also possible you may be looking for something that you can get by proper use of dtrace.
More broadly, you're not looking at the C# process library there, either. You're really looking at the Windows process library. It's predicated on a different culture and different assumptions and some of its functionality may be difficult or perhaps even impossible to implement on other systems (I note the Mono implementation has several explicit NotImplemented portions).
The subprocess[0] module is probably closer to what you're looking for, though it still does not operate the way you want it to. It's also possible you may be looking for something that you can get by proper use of dtrace.
More broadly, you're not looking at the C# process library there, either. You're really looking at the Windows process library. It's predicated on a different culture and different assumptions and some of its functionality may be difficult or perhaps even impossible to implement on other systems (I note the Mono implementation has several explicit NotImplemented portions).
[0] http://docs.python.org/2/library/subprocess.html