__init__.py

[Laughlin, Joseph V]

I'm browsing through a python program that's broken up into many
subdirectories and files.  In one of the higher-level directories is a
file called __init__.py.  Does this file have any special purpose?

Contents of __init__.py is:
__all__ = ["list", "of", "subdirectories"]

Joe Laughlin
NCO Simulation Labs
Integrated Defense Systems
The Boeing Company