title: How to install wheels within setup.py
body: <p>I'm creating a project that has dependencies on packages from PyPI. Namely :</p>
  
  <pre><code>['comtypes', 'docx', 'qrcode', 'PyPDF2', 'pyqtgraph', 'PyQt5', 'numpy', 'PIL','opencv-python']
  </code></pre>
  
  <p>However, some of these (for example <code>opencv-python</code>) only contain wheel files on PyPI. <a href="https://pypi.python.org/simple/opencv-python/" rel="noreferrer">https://pypi.python.org/simple/opencv-python/</a></p>
  
  <p>From my understanding, setuptools is not compatible with <code>.whl</code>. Is there any way to install the dependencies from a <code>setup.py</code>, ideally without the use of pip?</p>