ModuleNotFoundError when application is not installed via setup.py

[bytebutcher]

Hi there,

i've packaged my program and uploaded it to pypi. When installed via pip everything works flawlessly. However, when cloning the repository, installing all dependencies and running the main application (here: runner.py) i get a ModuleNotFoundError.

Error:
Traceback (most recent call last):
  File "dpp/runner.py", line 34, in <module>
    from dpp.core.argparse.ordered_multi_args import OrderedMultiArgs
ModuleNotFoundError: No module named 'dpp'

I use following folder structure:

Output:
decoder-plus-plus
├── dpp
│   ├── core
│   ├── images
│   ├── __init__.py
│   ├── __main__.py
│   ├── plugins
│   ├── runner.py
│   └── ui
├── LICENSE
├── MANIFEST.in
├── README.md
├── requirements.txt
└── setup.py

setup.py

...
setup(
    ...
    entry_points={
        "console_scripts": [
            "dpp=dpp.runner:main",
        ]
    },
)

I fixed the error by adding following code at the beginning of runner.py:

# FIX #27: Add 'dpp' to python package path if not present. 
#          This may happen when dpp was not installed via setup.py.
DPP_PACKAGE_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
if DPP_PACKAGE_PATH not in sys.path:
    sys.path.append(DPP_PACKAGE_PATH)

However, i don't think that my approach is common practice and that there is a more elegant solution to this.

I hope that all makes sense.

Any help would be much appreciated!

Note: The complete source code can be found at github.