Python Errors when importing module from child directory

Question

I have a project that has this file structure:

f1 f2 __init__.py a.py b.py main.py

main.py

from f2 import a ...

a.py

import b ...

b.py

print('Hello World!') ...

When I run main.py, I get an import error from a.py saying "ImportError: No module named 'b'" but when I run a.py, it functions as expected.

f2 was initially a github submodule and the repo name had dashes. I thought that might have been the problem so I changed f2 to a directory and copied over the files. This has not solved my issue.

I have also tried using importlib.

I would expect that a.py is able to import b.py since it is able to when I run a.py directly.

gmds · Accepted Answer · 2019-04-16 23:34:53Z

That's because a thinks that b is a standalone module, so it looks for it in the PYTHONPATH directories, including the current folder.

However, when you run from main, b is no longer in the current folder (main's folder), and so a can't find it.

To solve this, change the import in a.py to from . import b, which signals that b.py is in the same package and to perform a relative import accordingly.

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