Question

Possible Duplicate:
Retrieving python module path

Suppose I have code in 3 python files. x.py, y.py, z.py.

x calls y and y calls z. In the code in z.py, I want to know what directory x.py is in.

Is there a function that will tell me this?

EDIT
forget z.py. I just want y.py to print out the path of x.py.
EDIT

Note that the system has 30 different files all named x.py located in different directories.

Answer 1

If the code in z.py has indirectly imported x.py, it will be in sys.modules. So try:

module = sys.modules.get('x')
if module is not None:
    print module.__file__