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ModuleNotFoundError after pip install local python package

Structure:
.
├── application
│ └── runner.py
└── dummyLibrary
├── helperFunctions.py
├── __init__.py
└── setup.py
runner.py:
import dummyLibrary
dummyLibrary.foo()
dummyLibrary.bar()
init.py:
(empty file)
helperFunctions.py:
def foo():
print("called foo()")
def bar():
print("called bar()")
setup.py:
#!/usr/bin/env python
from distutils.core import setup
setup(name='dummyLibrary', version='0.0.1')
After cd'ing into dummyLibrary/ ,
I tried installing dummyLibrary with
pip3 install -e .
This was the output:
Defaulting to user installation because normal site-packages is not writeable
Obtaining file:///home/ubuntu/Documents/pythonTest/dummyLibrary
Preparing metadata (setup.py) ... done
Installing collected packages: dummyLibrary
Running setup.py develop for dummyLibrary
Successfully installed dummyLibrary-0.0.1
I tried installing dummyLibrary with
python3 -m pip install -e .
This was the output:
Defaulting to user installation because normal site-packages is not writeable
Obtaining file:///home/ubuntu/Documents/pythonTest/dummyLibrary
Preparing metadata (setup.py) ... done
Installing collected packages: dummyLibrary
Attempting uninstall: dummyLibrary
Found existing installation: dummyLibrary 0.0.1
Uninstalling dummyLibrary-0.0.1:
Successfully uninstalled dummyLibrary-0.0.1
Running setup.py develop for dummyLibrary
Successfully installed dummyLibrary-0.0.1
After cd'ing into application/ and running
python3 runner.py
I get:
Traceback (most recent call last):
File "runner.py", line 1, in <module>
import dummyLibrary
ModuleNotFoundError: No module named 'dummyLibrary'
no matter how I try to install my library
Why is this?
Additional Information:
Using Ubuntu, Not using a virtual environment.
I tried rebooting after installing. Didn't help.

Welcome to Stack Overflow!
First thing: __init__.py and helperFunctions.py should be inside another nested folder with the same name as the package.
.
├── application
│ └── runner.py
└── dummyLibrary
├── dummyLibrary
│ ├── __init__.py
│ └── helperFunctions.py
└── setup.py
Secondly, with the code in runner.py as how you'd like it, the __init__.py should include the following line to import all of the functions in helperFunctions.py:
from .helperFunctions import *
Finally, your setup.py should also include the parameter packages as a list of folder names in the package, in this case, the parameter should be packages=['dummyLibrary'].
P.S.: it's a pythonic practice to name your files and packages in snake_case rather than camelCase.

Creating python package without releasing it to pypi

Hi guys i have a problem with creating python package out of my project. I read some tutorials but every one leads to uploading files to pypi which i dont want to do. I just want to pip install it to my machine locally using tar.gz file.
Here's a structure of my project folder:
root
├── src
│ ├── __init__.py
│ ├── config.py
│ └── sth_a
│ │ ├── __init__.py
│ │ └── a.py
│ └── sth_b
│ ├── __init__.py
│ └── b.py
└── setup.py
Here is how my setup.py file looks like:
from setuptools import setup, find_packages
setup(name="mypkg",
version='0.0.1',
author="whatever",
packages=find_packages()
)
First i run command:
python setup.py sdist bdist_wheel
then it creatates dist dictionary with tar.gz file and wheel file, so i just run
pip3 install dist/mypkg-0.0.1.tar.gz
After this first problem emerges. To import these files somewhere else i need to write
from src.sth_a.a import *
but i want to do this like this
from mypgk.src.sth_a.a import *
or even if i just want to 'publish' for example functions from file a.py
from mypck.a import *
Also i was having another issues bit this answer helped me a bit but it is not still what i want pip install . creates only the dist-info not the package

Install Python package from monorepo

We have a private git monorepo which hosts a number of Python packages. Poetry was the dependency management tool initially chosen for the project. Anyway, due to this Poetry issue, it would not be accepted solution that involves creating new setup.py files.
A simplified version of the structure:
git-monorepo
├── pkg-1
│ ├── pkg
│ │ └── mod1.py
│ └── pyproject.toml
├── pkg-2
│ ├── pkg
│ │ └── mod2.py
│ └── pyproject.toml
└── lib
├── pkg
│ └── lib.py
└── pyproject.toml
The library distribution package lib is indepentent from any other package. However, pkg-1 depends on lib and pkg-2 depends on both pkg-1 and lib.
So, the question is:
How would be the proper way to use pip to install a package from this monorepo?
Let us consider as an example that we try to install pkg-1, where pkg-1/pyproject.toml includes the following lines:
...
[tool.poetry.dependencies]
lib = {path = "../lib/"}
...
The result from running pip, as explained in the VCS support documentation:
$ pip install -e git+https://gitlab.com/my-account/git-monorepo#"egg=pkg-1&subdirectory=pkg-1"
Traceback (most recent call last):
File "/home/hblanco/.local/lib/python3.8/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3101, in __init__
super(Requirement, self).__init__(requirement_string)
File "/home/hblanco/.local/lib/python3.8/site-packages/pip/_vendor/packaging/requirements.py", line 115, in __init__
raise InvalidRequirement("Invalid URL: {0}".format(req.url))
pip._vendor.packaging.requirements.InvalidRequirement: Invalid URL: ../lib

The problem in the above setup is that the dependency is specified as a path dependency. When installing it, it uses that path dependency.
I ran into the same issue with a python monorepo, where I wanted to share the packages also to other projects.
I found 2 approaches to work for me:
in the CI/CD build pipeline, edit the pyproject.toml just before creating the wheel (which is published to a pypi repo)
First create the wheel (or .tar.gz) artifact, and then modify it afterwards (by extracting it, replacing the path dependencies, and zipping it again).
The full approach I've explained here.
However, it won't work with the git+https://...
You'll need a (private) pypi repo somewhere. Gitlab provides one for each project, which I utilize in the demo project here

How to package a cython module?

I have some Cython wrapped C++ code that I want to package up. The package directory is structured like so:
.
├── PackageA
│ ├── Mypackage.pyx
│ ├── MyPackageC.cpp
│ ├── HeaderFile.h
│ ├── __init__.py
│ └── setup.py
├── requirements.txt
├── setup.py
I have previously been making a shared object file by running python setup.py build_ext --inplace using the setup.py file inside of the PackageA directory and importing the shared object file but I am unsure how to deal with this inside a package structure. How can I do this?

python setup.py install should do the right thing. You can check it by doing import PackageA from a separate python session outside of the project folder.

setup.py develop not respecting package kwarg

My folder structure looks like
.
├── my_package
│   ├── A.py
│   └── __init__.py
├── my_package2
│   ├── B.py
│   └── __init__.py
└── setup.py
And my setup.py looks like
from setuptools import setup
if __name__ == '__main__':
setup(name='my_packages',
packages=['my_package'])
When I run
python3 setup.py develop
The egg file is created locally and an egg-link file is placed in my site-packages directory. Also, the folder is added to easy_install.pth which means that both my_package and my_package2 are importable. This is different than running python3 setup.py install (only my_package would be available per the keyword argument passed to the setup function).
This same behavior occurs when installing with pip using the -e flag.
Is this intended behavior? Is there any way to replicate the functionality of install using develop?