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- TL;DR: you can't do relative imports from the file you execute since __main__ module is not a part of a package.
- Absolute imports - import something available on sys.path
- Relative imports - import something relative to the current module, must be a part of a package
- If you're running both variants in exactly the same way, one of them should work. Anyway, here is an example that should help you understand what's going on, let's add another main.py file with the overall directory structure like this:
- ```
- .
- ./main.py
- ./ryan/__init__.py
- ./ryan/config.py
- ./ryan/test.py
- ```
- And let's update test.py to see what's going on:
- ```
- # config.py
- debug = True
- # test.py
- print(__name__)
- try:
- # Trying to find module in the parent package
- from . import config
- print(config.debug)
- del config
- except ImportError:
- print('Relative import failed')
- try:
- # Trying to find module on sys.path
- import config
- print(config.debug)
- except ModuleNotFoundError:
- print('Absolute import failed')
- # main.py
- import ryan.test
- Let's run test.py first:
- ```
- ```
- $ python ryan/test.py
- __main__
- Relative import failed
- True
- ```
- Here "test" is the __main__ module and doesn't know anything about belonging to a package. However import config should work, since the ryan folder will be added to sys.path.
- Let's run main.py instead:
- ```
- $ python main.py
- ryan.test
- True
- Absolute import failed
- ```
- And here test is inside of the "ryan" package and can perform relative imports. import config fails since implicit relative imports are not allowed in Python 3.
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