newbie: package and import problems

[randy_shaffer at my-deja.com]

Hello.  I'm experiencing an ImportError that I do not understand.  I'm
hoping someone can point out what I'm missing - thanks in advance.

I have a package directory structure that looks like this:

TestHarness/
    __init__.py
    THDatabase/
        __init__.py
        THUser.py
        THUniverse.py

In THUser.py file, I have various class and function definitions
including a top level test() function that excersizes all the code in
the file.  From the interpreter command line, I can type:

>>> from TestHarness.THDatabase.THUser import *
>>> test()

Everything works just fine here.  There is a problem when just
executing the file stand-alone.  The two lines I have in the file that
I understand will enable this are the first:

#!/usr/local/bin/python

and the last:

if __name__ == '__main__': test()

The top few lines in the file look like this:

import TestHarness
import cPickle
import os
import string
from TestHarness.THDatabase.THUniverse import KnownUniverse

This last line causes the exception:

ImportError: No module named THDatabase.THUniverse

Why doesn't python see this file?  The top level package name is known
to sys.path.

I can make this go away by including the lines:

from TestHarness import *
from THDatabase import *
from THUniverse import *

But then, in a statement buried in the THUniverse.py file I get an
AttributeError for the variable TestHarness.RootDir.  This is given a
value in __init__.py in the top level package, TestHarness/.

What am I doing wrong?

Randy



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