[Python] Installed my own package but python can't find the modules

I've created my own package:

python_perso/
└── mypackage/
├── mypackage/
│ ├── __init__.py
│ ├── main.py
│ ├── scrapper.py
│ └── helpers.py
└── setup.py


__init__.py is empty.

main.py :

import scrapper
import helpers


def get_books():
...


setup.py :

from setuptools import find_packages, setup

setup(
name='mypackage', # Required
version='1.0.0', # Required
packages=find_packages(), # Required
)


Ctrl C + V package in my new project (my_project/lib/mypackage) then: pip install lib/mypackage/

Check that it works properly:

from mypackage import main

print(main.get_books())


Encoutering this error :

...
File "...\using_my_package\.venv\Lib\site-packages\mypackage\main.py", line 1, in <module>
import scrapper
File "C:\Program Files\JetBrains\PyCharm Community Edition 2024.3.1.1\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import
module = self._system_import(name, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'scrapper'


I tried to clarify the imports in mypackage:

from . import scrapper
from . import helpers


And it worked.. in the new project only. Because when I try to run code directly from mypackage :

...
File "...\using_my_package\lib\mypackage\mypackage\main.py", line 1, in <module>
from . import scrapper
File "C:\Program Files\JetBrains\PyCharm Community Edition 2024.3.1.1\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_import_hook.py", line 21, in do_import
module = self._system_import(name, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ImportError: attempted relative import with no known parent package


How can I solve this ?

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