title: how to clear unresolved import 'cv2' error?
body: <p>I have installed Python 3.9 on my ubuntu 18.04 desktop, i have already installed two libraries using <strong>pip3 install</strong>
  1)opencv-contrib-python
  2)opencv-python</p>
  <p>Currently i am writing a program in <strong>VSCode</strong> for which i am <strong>importing cv2</strong></p>
  <p>I have already default version of <strong>python 3.6.9</strong> in my computer. When i use default version as interpreter, program seems to be <strong>working fine</strong>.But if i switch the interpreter to newly installed <strong>python 3.9</strong> ,  i get an error
  <strong>ModuleNotFoundError: No module named 'cv2'</strong></p>
  <p>please someone who has faced such problem and know how to resolve it help me!!!...</p>