title: Missing python files with pip install from Nexus
body: <p>I have successfully upload my python package to Nexus. When I look in the package folder, there are two files :</p>
  <ul>
  <li>*.whl</li>
  <li>*tar.gz</li>
  </ul>
  <p>When I run the pip install command :</p>
  <pre><code>pip3 install --no-cache-dir --index-url https://nexus.my_host.com/repository/pypi-public/simple my_lib==0.0.0
  </code></pre>
  <p>It returns a success.</p>
  <p>When I look into the site-packages I only see the dist-info and the python files are missing.</p>
  <p>Here my setup.py :</p>
  <pre><code>import os
  from setuptools import setup, find_packages
  
  
  HERE = os.path.abspath(os.path.dirname(__file__))
  with open(os.path.join(HERE, &quot;README.md&quot;)) as f:
      README = f.read()
  with open('requirements.txt') as f:
      requirements = f.read().splitlines()
  setup(
      name='my_lib',
      version='0.0.0',
      description='My Lib',
      install_requires=requirements,
      long_description=README,
      long_description_content_type=&quot;text/markdown&quot;,
      packages=find_packages(
          exclude=[&quot;*.tests&quot;, &quot;*.tests.*&quot;, &quot;tests.*&quot;, &quot;tests&quot;]),
      license='MIT',
      python_requires='&gt;=3.6',
      classifiers=[
          &quot;License :: OSI Approved :: MIT License&quot;,
          &quot;Programming Language :: Python :: 3&quot;,
          &quot;Programming Language :: Python :: 3.7&quot;,
      ])
  </code></pre>
  <p>My tree looks like this :</p>
  <pre><code>/main_dir
    sources/
      __init__.py
      my_file.py
    setup.py
  </code></pre>
  <p>When I look in the tar.gz file there is the sources/ folder with my_file.py.</p>
  <p>Thanks for replies guys and have a nice day !</p>