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this is a core python concept, not a pulumi specific thing... have a read of

<https://chrisyeh96.github.io/2017/08/08/definitive-guide-python-imports.html#all-about-__init__py>

Yeah, I understand how init files work, it's just that if I leave them empty Pulumi is not importing the rest of the project, but looks like it's something I'm doing wrong. The answer here pointed to a potential solution. Thank you!

This is more about PYTHONPATH it's the same problem as in AWS Lambda. Where the PYTHONPATH starts from

__main__.py

In this case

__main__.py

can import from

python_package_in_path

pulumi_project/
  __main__.py
  python_package_in_path/
     __init__.py

but in this case, you cannot because

__main__.py

cannot see the sibling directory.

pulumi_project/
  __main__.py

python_package_not_in_path/
     __init__.py

So you need a way to get

python_package_not_in_path

in PYTHONPATH (aka

sys.path

)

Tx, I'll give this a try.