title: How to convert a .ui file to .py file with PyQt5 and python 3.6
body: <p>Converting a .ui file to a .py file using cmd</p>
  
  <p><code>C:/Python36/Lib/site-packages/PyQt5/pyuic.cpython-36.pyc -x mainwindow.ui -o mainwindow.py</code></p>
  
  <p>The error shows like </p>
  
  <pre><code>The system cannot find the path specified.
  </code></pre>
  
  <p>I checked the path, unfortunately, there is no file named in the PyQt folder</p>
  
  <p>please, someone, check this problem</p>