Constant error while referencing function in package (TypeError: 'module' object is not callable)

I get error while trying to execute pytest UTs for the project.

E       TypeError: 'module' object is not callable

I have the following repository structure:

├───src
│   └───company
│       ├───acc
│       └───dp
│           └───logic
│               ├───business
│               │   ├───__init__.py 
│               │   ├───alter_customer.py
│               │   ├───filter_customer.py
│               │   └───review_customers.py
│               └───general
│                   ├───some_function.py
│                   └───__init__.py
├───tests
│   └───company
│       └───dp
│           └───logic
│                └───business
│                    ├───test_alter_customer.py
│                    └───test_review_customers.py
├───conftest.py
└───pyproject.toml

Each file under business package contains one function with the same name as the file.

Let's imagine file filter_customer.py like that:

def filter_customer(i: int) -> int:
    return i

Let's imagine file review_customers.py like that:

from company.dp.logic.general import some_function
def review_customers() -> str:
    x = some_function("custom")
    return x

Let's imagine file alter_customer.py like that:

from company.dp.logic.business import filter_customer
def alter_customer() -> str:
    x = filter_customer(10) <- this line raise error while trying to run Unit Test
    return x

UT looks something like that:

from company.dp.logic.business import alter_customer
def test_alter_customer():
    x = alter_customer()
    assert x == 10

./business/__init__.py file for business package looks like that:

from company.dp.logic.business.alter_customer import alter_customer
from company.dp.logic.business.filter_customer import filter_customer
from company.dp.logic.business.review_customers import review_customers

./general/__init__.py file for business package looks like that:

from src.company.dp.logic.general.some_function import some_function 

pyproject.toml

[build-system]
requires = ["setuptools"]
build-backend = "setuptools.build_meta"

[tool.setuptools.packages.find]
where = ["src"]

[tool.pytest.ini_options]
addopts = [
]
testpaths = ["tests/company/dp/logic/business"]
python_files = "test_*.py"
python_functions = "test_*"
pythonpath = "src"
norecursedirs = "*"

How to correctly organize the packages/modules in such scenario?

The goal was to have one function per file and packages like business and general to cover imports from modules.

I have tried multiple versions.

When I use direct import from module/file, it work. It also works when I call function from different package like general.

# This works:
from src.company.dp.logic.business.filter_customer import filter_customer

# With this I have error, even though IDE resolve it correctly:
from src.company.dp.logic.business import filter_customer


# This works:
from src.company.dp.logic.general import some_function

def review_customers()
    c = filter_customer(10)
    return something

I prepared repository which allows to recreate this problem: https://github.com/paweltajs/module-package/tree/main

Edit. Few other observations.

When I change the name of the function to differ from file name, I got different error:

E   ImportError: cannot import name 'f_filter_customer' from partially initialized module 'company.dp.logic.business' (most likely due to a circular import) (C:\Repositories\module-package\src\company\dp\logic\business\__init__.py)

When I put import within the function, it works. Like that:

def alter_customer() -> str:
    from company.dp.logic.business import filter_customer
    x = filter_customer(10)
    return x