Can't import subfolders from python module on GitHub

Question

I have a simple python package that I've published on GitHub. I installed the package locally on my machine using pip. I am trying to import a subfolder of the module but I keep getting a ModuleNotFoundError: No module named 'package_folder.subfolder1'

├── package_name/
│   ├── README.md
│   ├── setup.py
│   └── package_folder
│       ├── __init__.py
│       ├── file1.py
│       ├── file2.py
│       ├── subfolder1/
│       │   ├── __init__.py
│       │   ├── file11.py
│       │   └── file12.py

I have the __init__.py files in both directories, so I'm not sure why I am unable to access the subfolder1 files.

I am able to import file1.py and file2.py from the top-level package_folder with from package_folder import file1.py.

Answer 1

In the setup.py you have to include the subfolder in the packages as well. So, in setup.py instead of:

packages=['package_folder']

You have to do:

packages=['package_folder', 'package_folder/subfolder1']