opencv installation

Question

`I tried installing opencv on my raspi 3B using pip, on trying to import cv2 i am getting an error Edit: code lines:

Successfully installed opencv-python-4.1.1.26

`(cv) pi@raspberrypi:~ $ workon cv
(cv) pi@raspberrypi:~ $ python

import cv2
Traceback (most recent call last):
File "", line 1, in
File "/home/pi/.virtualenvs/cv/lib/python3.7/site-packages/cv2/init.py", l ine 3, in
from .cv2 import *
ImportError: libQtGui.so.4: cannot open shared object file: No such file or dire ctory`

EDIT
import cv2 is working
There was a library missing: sudo apt-install libQtGui4 worked for me

Answer 1

The reason you cannot access opencv in your virtualenv is because you have installed opencv in your system python environment. Each virtualenv keeps its packages separate from other vitualenvs and the system python. You can see the list of pacakges available from within each environment by pip list

To access opencv in your vitualenv:

workon cv
pip install opencv-python