Question about packages

[djw]

I'm sturcturing my (relatively) large application into packages and am
having trouble understanding one aspect of module/package paths.

If I have a structure like:

in /:
appA.py
__init__.py

in X/:
modX1.py
modX2.py
__init__.py

in Y:/
modY1.py
__init__.py

Now, if I do the following imports and run appA.py, all is well:

in appA.py:
from X import modX1
import Y.modY1

in modX1:
import modX2

in modY1: (as long as run from appA.py)
import X.modX1

But, if I try to create a test harness inside modY1 (in an if statement
checking __name__ with "__main__") and run modY1.py with the last import
(import X.modX1), I get an ImportError.

So, the question is, how do you import into a sub-package to allow both
a script at the root level to import the module ("library mode") and for
the module itself to run in "test harness" mode with the same import?

Any hints appreciated.

-Don

[Mark McEahern]

Re: Question about packages

On Mon, 2003-12-29 at 21:44, djw wrote:[color=blue]
> So, the question is, how do you import into a sub-package to allow both
> a script at the root level to import the module ("library mode") and for
> the module itself to run in "test harness" mode with the same import?[/color]

You could do something like:

try:
import X.modX1
except ImportError:
if __name__ == '__main__':
# Hmm, must be running the test harness, adjust
# sys.path appropriately, then retry import
import sys
sys.path.insert (0, whatever)
import X.modX1

but that smells.

Maybe it's best to separate tests from code?

Cheers,

// m