Python project structure and relative imports

Question

I'm new to Python and I searched google a lot and read some articles about relative imports etc. Despite the fact that I am unable to get it working. Please, consider my following project structure:

/Project
 /docs
 /log
 /prev
 /src
 a.py
 /tests
 /tests1
 b.py
 /tests2
 .gitignore
 README.txt
 program.py

And what I'm trying to achieve is to import a class from file a.py inside of the script b.py. Generally speaking, script b.py should have line with import of a.py. I've read some articles about using __init__.py files, where should I put them? And should I change PYTHONPATH some way, how? And last question, is project structure OK? Thank you for your time and help!

• jonrsharpe: Have a look at e.g. jeffknupp.com/blog/2013/08/16/… - you should write a setup.py and install your package for import by the tests. The /tests directory itself isn't usually a module (so no __init__.py) - see pytest.org/latest/goodpractises.html#goodpractises
• Tom Dalton: @jonrsharpe "the /tests directory itself isn't usually a module" - do you mean package rather than module there?
• jonrsharpe: @TomDalton yes, package
• Łukasz Rogalski: Possible duplicate of Running unittest with typical test directory structure

Answer 1

You need to use Python unit tests and you can start with how-do-i-run-all-python-unit-tests-in-a-directory.