[Python] PyCharm unresolved reference on import

Why does PyCharm underline these imports:

from oauth2_helper import (_url, get_token, get_session)
from config import scope


as Unresolved reference, but if I add dots in front:

from .oauth2_helper import (_url, get_token, get_session)
from .config import scope


I don't get the error underline in PyCharm; then when running my app from the terminal, I get this error:

ModuleNotFoundError: No module named '__main__.oauth2_helper'; '__main__' is not a package

Why is this happening?

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