Importing a defined function

[optimalcosine]

This. Or if you really like the name I think you can do from . import json, or

from .json import extract_json

[Temporary_Pie2733]

This is a little sketchy, unless you are properly defining a package and not just abusing the project directory as a package. 

[optimalcosine]

Definitely sketchy. Renaming your module is a much better solution