Python3: problem to import personals modules

[PyForIO]

Hi, all.

I have a problem to import personals modules.

My folder:

test.py
/modules/__init__.py
/modules/config.py
/modules/notification.py

I execute just the script 'test.py', by IDLE, or by run into terminal.
This script call the module 'config.py' without any problem... as:

from modules.config import Config

the 'config.py' need module 'notification.py', and i wrote the code as:

try:
    from modules.notification import Info
except ImportError:
    print(f'Cant import notification module onto Config')
    sys.exit(1)

Result the error:

Error:
Cant import notification module onto Config

I tested with:

from modules import notification

or, by using:

from __future__ import absolute_import

try:
    from . import notification
except ImportError:

or

from .modules import notification

Same problem!

Really, i dont understand!?