Hi,
Ok, this is a topic that I've never really understood properly, so I'd like to
find out what's the "proper" way of doing things.
Say I have a directory structure like this:
furniture/
__init__.py
chair/
__init__.py
config.yaml
build_chair.py
common/
__init__.py
shared.py
table/
__init__.py
config.yaml
create_table.sql
build_table.py
The package is called furniture, and we have modules chair, common and table
underneath that.
build_chair.py and build_table.py are supposed to import from common/shared.py
using relative imports. e.g.:
from ..common.shared import supplies
However, if you then try to run the scripts build_chair.py, or build_table.py,
they'll complain about:
ValueError: Attempted relative import in non-package
After some Googling:
http://stackoverflow.com/questions/11536764/attempted-relative-import-in-non-package-even-with-init-py
http://stackoverflow.com/questions/72852/how-to-do-relative-imports-in-python
http://stackoverflow.com/questions/18888198/getting-attempted-relative-import-in-non-package-error-in-spite-of-having-init
http://stackoverflow.com/questions/14664313/attempted-relative-import-in-non-package-although-packaes-with-init-py-in
http://melitamihaljevic.blogspot.com.au/2013/04/python-relative-imports-hard-way.html
The advice seems to be either to run it from the parent directory of furniture
with:
python -m furniture.chair.build_chair
Or to have a main.py outside of the package directory and run that, and have it
import things.
However, I don't see having a separate single main.py outside my package would
work with keeping my code tidy/organised, and or how it'd work with the other
files (config.yaml, or create_table.sql) which are associated with each script?
A third way I thought of way just to create a setup.py and install the package
into site-packages - and then everything will work? However, I don't think that
solves my problem of understanding how things work, or getting my directory
structure right.
Although apparently running a script inside a package is an anti-pattern?
(https://mail.python.org/pipermail/python-3000/2007-April/006793.html)
How would you guys organise the code above?
Also, if I have tests (say with pyttest), inside
furniture/table/tests/test_table.py, how would I run these as well? If I run
py.test from there, I get the same:
$ py.test
....
from ..table.build_table import Table
E ValueError: Attempted relative import in non-package
....
(Above is just an extract).
Assuming I use pytest, where should my tests be in the directory structure, and
how should I be running them?
Cheers,
Victor
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