How to import cv2 in python3?

I'm using Windows, and I'm trying to install package cv2 for python3.

I did a pip3 install opencv-python and it reports successful:

But when I do the import cv2 from python3, it's not found and I get weird errors:

What am I doing wrong?

8 Answers

Your screenshot shows you doing a pip install from the python terminal which is wrong. Do that outside the python terminal. Also the package I believe you want is:

pip install opencv-python 

Since you're running on Windows, I might look at the official install manual:

opencv2 is ONLY compatible with Python3 if you do so by compiling the source code. See the section under opencv supported python versions:

Make a virtual enviroment using python3

virtualenv env_name --python="python3" 

and run the following command

pip3 install opencv-python 

There is a problem with pylint, which I do not completely understood yet.

You can just import OpenCV with: from cv2 import cv2

Please check your python version. Mine is 3.7.3 on a Mac macOS Catalina Version 10.15.7. If you are using Jupyter notebook, pip3 install opencv-python is enough. In your notebook menu click on Kernel and hit restart. Please see the image I included. Kernel>Restart Then run your code again. In my case that solved the problem.

well, there was 2 issues: 1.instead of pip, pip3 should be used. 2.its better to use virtual env. because i have had multiple python version installed

anaconda prompt -->pip install opencv-python

The best way is to create a virtual env. first and then do pip install , everything will work fine

Use '!' before the pip:

! pip install opencv-python