How to use Python's cv2 library and download the OpenCV library?

cv2 library is in the opencv library, so you need to download opencv-python
1. Open the windows command line:

win R
cmd

2. Update pip version (not necessary):

python -m pip install --upgrade pip

3. Use pip to download opencv:
It is best to download the numpy library before downloading the opencv library.
The mirror source of the University of Science and Technology of China is used here: https://pypi.mirrors.ustc.edu.cn/simple/

pip install numpy -i https://pypi.mirrors.ustc. edu.cn/simple/
pip install opencv-python -i https://pypi.mirrors.ustc.edu.cn/simple/

4. View the downloaded libraries and versions ：

pip list

5. Code application cv2:
Create a new .py file in Pycharm and write the code :

import cv2

The code does not report an error, basically you can use the opencv library.

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