[Python] My privately developed and installed module gives "ModuleNotFoundError: No module...

I'm implementing my own Python module package, called jbpy. I'm using setuptools with a pyproject.toml file as the build system.

I'm working on Ubuntu 24.04, but I also get the error under WSL on a Windows 11 machine. I have also tried to install the module as root, to make it globally available. That just produces the same error, when I try to import it.

The module builds fine, and there are no problems installing the module, by telling pip to install the wheel file, when I install it.

I use this command to build the package:

python3 -m build


And I use this command to install the package:

python3 -m pip install dist/jbpy-0.0.2.9-py3-none-any.whl


When I try to import the module I get this error:

$ ./importtest.py
Traceback (most recent call last):
File "/home/jbang/development/projects/jbpy/test/./importtest.py", line 8, in <module>
import jbpy.logging
ModuleNotFoundError: No module named 'jbpy'


The importtest.py script is very simple:

#!/usr/bin/python3
# -*- coding: UTF-8 -*-

# Test importing the module

import jbpy.logging

if __name__ == "__main__":
print("Modules imported")


I'm sure the module is installed, so why can't Python find it?

This is the details about how the module was installed:

$ python3 -m pip install dist/jbpy-0.0.2.9-py3-none-any.whl
Defaulting to user installation because normal site-packages is not writeable
Processing ./dist/jbpy-0.0.2.9-py3-none-any.whl
Installing collected packages: jbpy
Attempting uninstall: jbpy
Found existing installation: jbpy 0.0.2.8
Uninstalling jbpy-0.0.2.8:
Successfully uninstalled jbpy-0.0.2.8
Successfully installed jbpy-0.0.2.9

$ pip list | grep jbpy
jbpy 0.0.2.9

$ pip show jbpy
Name: jbpy
Version: 0.0.2.9
Summary: A package with utility functions to make my Python life easier.
Home-page:
Author:
Author-email: Jens Bang <jbpy@snej.dk>
License:
Location: /home/jbang/.local/lib/python3.12/site-packages
Requires:
Required-by:


And the configuration of module paths in Python is this:

sys.executable='/usr/bin/python3'

sys.path = [
'/home/jbang/development/projects/jbpy/test',
'/usr/lib/python312.zip',
'/usr/lib/python3.12',
'/usr/lib/python3.12/lib-dynload',
'/home/jbang/.local/lib/python3.12/site-packages',
'/usr/local/lib/python3.12/dist-packages',
'/usr/lib/python3/dist-packages',
'/usr/lib/python3.12/dist-packages'
]

sysconfig.get_default_scheme()='posix_local'
sysconfig.get_preferred_scheme("prefix")='posix_local'
sysconfig.get_preferred_scheme("home")='posix_home'
sysconfig.get_preferred_scheme("user")='posix_user'

sysconfig.get_paths('posix_local') = {
'stdlib' : '/usr/lib/python3.12',
'platstdlib' : '/usr/lib/python3.12',
'purelib' : '/usr/local/lib/python3.12/dist-packages',
'platlib' : '/usr/local/lib/python3.12/dist-packages',
'include' : '/usr/include/python3.12',
'platinclude' : '/usr/include/python3.12',
'scripts' : '/usr/local/bin',
'data' : '/usr/local'
}
sysconfig.get_paths('posix_home') = {
'stdlib' : '/usr/lib/python',
'platstdlib' : '/usr/lib/python',
'purelib' : '/usr/lib/python',
'platlib' : '/usr/lib/python',
'include' : '/usr/include/python',
'platinclude' : '/usr/include/python',
'scripts' : '/usr/bin',
'data' : '/usr'
}
sysconfig.get_paths('posix_user') = {
'stdlib' : '/home/jbang/.local/lib/python3.12',
'platstdlib' : '/home/jbang/.local/lib/python3.12',
'purelib' : '/home/jbang/.local/lib/python3.12/site-packages',
'platlib' : '/home/jbang/.local/lib/python3.12/site-packages',
'include' : '/home/jbang/.local/include/python3.12',
'scripts' : '/home/jbang/.local/bin',
'data' : '/home/jbang/.local'
}

sysconfig.get_python_version()='3.12'
sysconfig.get_platform()='linux-x86_64'
os.name='posix'
sysconfig.get_path('stdlib') = '/usr/lib/python3.12'
sysconfig.get_path('platstdlib') = '/usr/lib/python3.12'
sysconfig.get_path('purelib') = '/usr/local/lib/python3.12/dist-packages'
sysconfig.get_path('platlib') = '/usr/local/lib/python3.12/dist-packages'
sysconfig.get_path('include') = '/usr/include/python3.12'
sysconfig.get_path('scripts') = '/usr/local/bin'
sysconfig.get_path('data') = '/usr/local'


My pyproject.toml file looks like this:

[build-system]
requires = ["setuptools >= 77.0.3"]
build-backend = "setuptools.build_meta"

[project]
name = "jbpy"
version = "0.0.2.9"
authors = [{name = "Jens Bang", email = "xxxx@xxxx.xx"}]
description = "A package with utility functions to make my Python life easier."
readme = "README.md"
requires-python = ">=3.6"
license = "BSD-3-Clause"
classifiers = [
"Programming Language :: Python :: 3",
]

[tool.setuptools.packages.find]
where = ["src"] # list of folders that contain the packages (["."] by default)
include = ["argparse*", "logging*", "json*"] # package names should match these glob patterns (["*"] by default)
exclude = ["__*"] # exclude packages matching these glob patterns (empty by default)
namespaces = false # to disable scanning PEP 420 namespaces (true by default)


My files are arranged like this:

.
├── changelog.md
├── dist/
├── generate_package.sh
├── install_package.sh
├── pyproject.toml
├── README.md
├── requirements.txt
├── src
│ ├── argparse.py
│ ├── general.py
│ ├── __init__.py
│ ├── jbpy.egg-info/
│ ├── json.py
│ └── logging.py
├── test/
└── venv/

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