[Tutor] Question about install.py

[sp6 at rice.edu]

Hello,

I'm new to Python and was wondering if someone could answer a question I have.
Say that I have a python library, arithmetic-0.5, located at /X/arithmetic-0.5
I'd like to run setup and install it. But I guess since  
/X/arithmetic-0.5 is not in install.py's default search path, it comes  
back with an error saying that it cannot find the necessary files.
Can you please tell me how I can change the search path of install.py?  
What parameter do I need to modify?

Thanks in advance.