ROS2 Python relative import of my scritps

edit

Hi guys, I have a project on Raspberry pi 3, a compiled ROS2 foxy from source, install Kivy and everything if fine. But now I'm trying to port my UI from ROS1 to ROS2 and I can't figure out how to do relative imports like from utils. See to code.

Package(ROS2) hierarchy:

control_panel_ui
├── control_panel_ui
│   ├── graphical_interface.py
│   ├── __init__.py
│   ├── listeners
│   │   ├── __init__.py
│   │   └── start_listeners.py
│   ├── media
│   │   └── image.png
│   └── utils
│       ├── dict_services.py
│       ├── get_rpc.py
│       ├── __init__.py
│       ├── states.py
│       └── vehicle_state.py
├── package.xml
├── setup.cfg
├── setup.py
├── ...

And the code. Kivy is imported fine but my code such as utils, listeners etc. doesn't.

#kivy.require('1.7.2')
from kivy.app import App
 ...
from kivy.clock import Clock

from .utils.vehicle_state import VehicleState
from .utils.dict_services import dict_serv
from .utils.get_rpc import get_rpc_function

...

After the colcon build [package].py is moved to the install directory but those utils doesn't and then it it says cannot find package.

edited: Maybe the thing is I don't know how to configure setup.py/.cfg. Maybe a link or an example would be great. I was not able to find anything uselful.

added setup.py/.cfg

from setuptools import setup

package_name = 'control_panel_ui'

setup(
    name=package_name,
    version='0.0.0',
    packages=[package_name],    
    data_files=[
        ('share/ament_index/resource_index/packages',
            ['resource/' + package_name]),
        ('share/' + package_name, ['package.xml'])
    ],
    install_requires=['setuptools'],
    zip_safe=True,
    maintainer='pi',
    maintainer_email='michal@michal.com',
    description='TODO: Package description',
    license='TODO: License declaration',
    tests_require=['pytest'],
    entry_points={
        'console_scripts': [
            'control_panel_ui = control_panel_ui.graphical_interface:graphical_interface'
        ],
    },
)

cfg

[develop]
script-dir=$base/lib/control_panel_ui
[install]
install-scripts=$base/lib/control_panel_ui