title: Including a data folder in a python package using setup.cfg
body: <p>I have the following setup.cfg file, a usual project I want to publish to pypi and which should be shipped with a data folder, in my case ru_core_news_sm-3.1.0. (I am using setuptools):</p>
  <pre><code>[metadata]
  name = test-project-name
  version = 0.6.0
  
  [options]
  packages = find:
  python_requires = &gt;=3.6
  include_package_data = True
  install_requires = 
      spacy==3.1.3
      beautifulsoup4
  
  [options.package_data]
  test_project_name/ru_core_news_sm-3.1.0 = *.*
  </code></pre>
  <p>This is my directory structure</p>
  <pre><code>base_project_name/
  ├── test_project_name
  │   ├── __init__.py
  │   ├── a.py
  │   └── ru_core_news_sm-3.1.0
  ├── pyproject.toml
  ├── MANIFEST.in
  └── setup.cfg
  </code></pre>
  <p>and I have this in my MANIFEST.in:</p>
  <pre><code>recursive-include test_project_name/ru_core_news_sm-3.1.0 *.*
  </code></pre>
  <p>I am testing the install by executing <code>pip install path/to/base_project_name</code></p>
  <p>However, this does not get me all files in the data folder, but only some of them, and I don't know why.</p>
  <p>These are the files in the base folder:</p>
  <p><a href="https://i.stack.imgur.com/KYuWV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KYuWV.png" alt="before" /></a></p>
  <p>and this is what remains when I have &quot;test installed&quot; it using pip to some other location (both projects use venv):</p>
  <p><a href="https://i.stack.imgur.com/XzUwj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XzUwj.png" alt="after" /></a></p>
  <p>What could be the reason?</p>