title: How to fix "Could not find a version that satisfies the requirement opencv-python"
body: <p>I am trying to make some basic facial recognition with my raspberry pi using OpenCV-python, however, I am unable to install OpenCV-python using pip3.</p>
  
  <p>I tried to follow this guide 
  <a href="https://pysource.com/2018/10/31/raspberry-pi-3-and-opencv-3-installation-tutorial/" rel="nofollow noreferrer">https://pysource.com/2018/10/31/raspberry-pi-3-and-opencv-3-installation-tutorial/</a>
  once this didn't work I tried using a fresh os and upgrading python to no avail.</p>
  
  <p>This is what happens when I input the pip3 command </p>
  
  <pre><code>pi@raspberrypi:~ $ pip3  install opencv-python
  Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
  Collecting opencv-python
    ERROR: Could not find a version that satisfies the requirement opencv-python (from versions: none)
  ERROR: No matching distribution found for opencv-python
  </code></pre>
  
  <p>I expect that opencv-python should start installing</p>