[Python] python series of No module named <module name>

Consider this project tree:

project
│
└── app/
│
├── main.py
├── __init__.py
│
├── common/
│ ├── __init__.py
│ └── do_common.py
│
└── util/
├── __init__.py
└── do_util.py


main.py

import sys
from pathlib import Path

from common.do_common import foo

sys.path.append(str(Path(__file__).resolve().parent))

foo()


do_common.py

def foo():
print("foo")


run with activated venv

python -m app.main


I get an error ModuleNotFoundError: No module named 'common'

To fix this, I would need to change the import to

from .common.do_common import foo #### Adding a dot 「.」before `common` module


and able to print foo

However, if I do call the do_util.py from do_common.py like below:

from util.do_util import bar


def foo():
print("foo")
bar()


I get ModuleNotFoundError: No module named 'util'

Changing the import to

from .util.do_util import bar


returns

ModuleNotFoundError: No module named 'app.common.util'


How should I fix the issue where I wont need to prepend the modules with a dot?

It is Python 3.12 in windows 10.

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