问题:

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?

回答1:

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: https://breakthrough.github.io/Installing-OpenCV

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

回答2:

Make a virtual enviroment using python3

virtualenv env_name --python="python3"

and run the following command

pip3 install opencv-python

回答3:

anaconda prompt -->pip install opencv-python

回答4:

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