pytest cannot import module while python can

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Found the answer:

DO NOT put a __init__.py file in a folder containing TESTS if you plan on using pytest. I had one such file, deleting it solved the problem.

This was actually buried in the comments to the second answer of PATH issue with pytest ‘ImportError: No module named YadaYadaYada’ so I did not see it, hope it gets more visibility here.

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