[Python] Importing python files from other directories?

I'm writing a resource mining game at the moment, and I want players to be able to easily add "expansions" to the game which add on more resources or mechanics. I have a structure that looks like this:

Saltminer/
gameData/
main.py
mods/
saltResource/
saltData.py
saltConfig.py
stoneResource/
stoneData.py
stoneConfig.py
icon.ico


I need a way for the main.py file to access the variables contained within all of the "<resource>Config.py" files and all of the "<resource>Data.py" files.

To try this, I tried using the import function, having set a variable in saltData called testVariable...

from mods import *
print(saltData.testVariable)


And I got an error saying that saltData is not defined.

I also tried:

from mods import *
print(saltResource.saltData.testVariable)


And got the following error:

Traceback (most recent call last): File "C:\gameData\main.py", line 2, in <module> print(saltResource.saltData.testVariable) ^^^^^^^^^^^^ NameError: name 'saltResource' is not defined

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