I have my files like this:
main.py
folder/
    __init__.py
    file_to_import.py
    other_file_used_by_file_to_import.py
I get a ModuleNotFoundError when I use import folder.file_to_import
then I tried from .file_to_import import function then I get a 
ModuleNotFoundError: No module named '__main__.admin_menu'; '__main__' is not a package
can't seem to be able to find who to do this properly in python3.
