[Tutor] import issues

[dn]

On 10/01/24 07:06, James Hartley wrote:
>   I admit that I have not internalized how Python's import system works yet.
> Given the following directory structure:
> 
> +-project
>      |
>      +-src
>      |   |
>      |   +-__init__.py
>      |   +-foo.py
>      |
>      +-tests
>          |
>          +-test_foo.py
> 
> Currently, __init__.py is empty.  What needs to be placed in __init__.py

Nothing - it's not relevant to this discussion.


> and test_foo.py in order for pytest to execute all tests in test_foo.py?
> pytest is being executed while in the project directory.  With:
> 
> from foo import Foo
> 
> --or--
> 
> from src.foo import Foo
> 
> defined in test_foo.py, pytest reports "ModuleNotFoundError: No module
> named 'src'".
> 
> Any and all comments would be appreciated.  Any links to online sources
> would also be appreciated. Thanks!

I use the latter, except:

- using PyCharm's auto-testing feature. However, 'translating' those 
commands back to manual-typing, would be something like:

python -m pytest /path/project/tests/test_test_foo.py --no-header 
--no-summary -q

- prepending "python -m"
which configures the sys.path to include current/project directory (and 
hence the "src.foo" relative-addressing) which likely accounts for the 
issues outlined (above)


Web.Refs:
Specifics: 
https://docs.pytest.org/en/7.4.x/explanation/pythonpath.html#pytest-vs-python-m-pytest
and the rest of the online-manual (although I have to say, even after 
years of use, I find it somewhat overwhelming)

Somewhat easier is the 'book of words', Brian Okken's: 
https://www.amazon.com.au/Python-Testing-pytest-Effective-Scalable/dp/1680508601/ref=sr_1_1?keywords=brian+okken&qid=1704838720&sr=8-1 

(disclaimer: there are other book-sellers. No commission claimed)

Coursera on-line training: (amongst many 'Python' courses)
Testing and Debugging Python 
https://www.coursera.org/projects/testing-and-debugging-python
- is a $paid project approach
Possibly slightly off (your) topic is LearnQuest's 'TDD Specialisation': 
https://www.coursera.org/learn/test-driven-development-overview
(which I think can be "audited" for $free)
NB have not completed either, and thus can't comment on quality, nor 
degree of pytest-content.

-- 
Regards,
=dn