python packaging for relative imports

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ValueError: Attempted relative import in non-package

Means you attempt to use relative import in the module which is not package. Its problem with the file which has this from ... import statement, and not the file which you are trying to import.

So if you are doing relative imports in your tests, for example, you should make your tests to be part of your package. This means

  1. Adding __init__.py to test/
  2. Running them from some outside script, like nosetests

If you run something as python myClass/test/demo.py, relative imports will not work too since you are running demo module not as package. Relative imports require that the module which uses them is being imported itself either as package module, from myClass.test.demo import blabla, or with relative import.

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