title: ImportError to import cv2 on python
body: <p>I I'm following this tutorial to start with YOLOV4: <a href="https://www.youtube.com/watch?v=5pYh1rFnNZs" rel="nofollow noreferrer">https://www.youtube.com/watch?v=5pYh1rFnNZs</a></p>
  <p>But when trying to import OpenCV with &quot;import cv2&quot; in python terminal the following message appears:</p>
  <pre><code>** On entry to DGEBAL parameter number  3 had an illegal value
  ** On entry to DGEHRD  parameter number  2 had an illegal value
  ** On entry to DORGHR DORGQR parameter number  2 had an illegal value
  ** On entry to DHSEQR parameter number  4 had an illegal value
  ImportError: numpy.core.multiarray failed to import
  Traceback (most recent call last):
  File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  File &quot;C:\Users\LUCINALDO\AppData\Local\Programs\Python\Python37\lib\site-packages\cv2\__init__.py&quot;, line 5, in &lt;module&gt;
  from .cv2 import *
  ImportError: numpy.core.multiarray failed to import
  </code></pre>
  <p>I already tried to update numpy, OpenCV or install other libraries but the error persists. What am I doing wrong?</p>