Hello,
I'm developing a package. I need user/test/special modules (inside or outside
the package) to import given modules from the package, or the whole package or
a sub-package. I'm looking for a general solution for this.
For an importing module located inside the package, the obvious solution is to
use a relative import. But this does not work (for what reason?) if the
importer is not itself imported as element of the package (error: "relative
import attempted in non package", or such). Even if it's indeed inside the
package, in a dir with an __init__.py. I've found some posts on this bug, but
no reason stated, and no solution.
For instance, a test module part of a package cannot import what it is intended
to test... Same thing for a module that holds its own test suite (and thus
indeed needs to be run stand- alone).
Note that the package's dir and every subdir hold __init__.py pseudo-modules.
Is there a solution I'm overlooking to use relative imports?
Now, for using absolute imports, IIUC the package's dir must be on python's
package search path list, meaning sys.path, is that all? I tried to extend
sys.path using
* PYTHONPATH
* a custom spir.pth (placed inside /usr/lib/pythonX.Y on Linux)
Both methods fail by me: sys.path still does not hold the package's dir, thus
absolute imports fail (error: "no module called...").
One more question: in both cases above, I added *both* the package's proper
dir, and the dir above it, eg both /home/me/prog/python &
/home/me/prog/python/packname. What's the right one? (the package's top
__init__.py is in /home/me/prog/python/packname)
In any case, if I manage to add /home/me/prog/python to sys.path, will all
packages (each located in a sub-dir from there) be found? Or do I need to add
one path per package, even if they're all grouped in a super-dir?
Denis
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