title: Create example files in module Python 3
body: <p>I am developing a Python package and I'd like to add some examples to it.
  My goal is to be able to execute them by doing something like:
  <code>python3 -m package.examples.example_file_1</code></p>
  <p>And the example1 will be executed</p>
  <p>However, I can't figure out how to do so.
  This is my file structure:</p>
  <pre class="lang-sh prettyprint-override"><code>Package
   |─ examples
   |   |─ __init__.py
   |   |─ example_file_1.py
   |   |─ example_file_2.py
   |   |─ example_file_3.py
   |─ __init__.py
   |─ package_file_1.py
   |─ package_file_2.py
   |─ package_file_3.py
   |─ package_file_4.py
  </code></pre>
  <p>When I run the <code>python3 -m package.examples.example_file_1</code> command, I get this:</p>
  <pre><code>/usr/bin/python3.8: Error while finding module specification for 'package.examples.example_file_1' (ModuleNotFoundError: No module named 'package.examples')
  </code></pre>
  <p>Solution: In my setup.py file I was using <code>setuptools.find_packages()</code> instead of <code>setuptools.find_namespace_packages()</code> which is what is supposed to be used in python 3.3+</p>