I can't install opencv-contrib-python with pip

Question

Occured probrem

I ran the following command to install an older version of opencv-contrib-python (4.0.0.21). Then an error occurred and this package could not be installed. How can I resolve this error?

pip install opencv-contrib-python==4.0.0.21
Collecting opencv-contrib-python==4.0.0.21
  ERROR: Could not find a version that satisfies the requirement opencv-contrib-python==4.0.0.21 (from versions: 3.4.8.29, 3.4.9.31, 3.4.9.33, 3.4.10.35, 3.4.10.37, 3.4.11.39, 3.4.11.41, 3.4.11.43, 3.4.11.45, 4.1.2.30, 4.2.0.32, 4.2.0.34, 4.3.0.36, 4.3.0.38, 4.4.0.40, 4.4.0.42, 4.4.0.44, 4.4.0.46)
ERROR: No matching distribution found for opencv-contrib-python==4.0.0.21

Environment

• Windows 10
• Python 3.8.2
• Pip 19.2.3

Answer 1

The version you specified opencv-contrib-python (4.0.0.21) does not have a relevant python3.8 version.

You need to use opencv corresponding to python3.8, or lower your python version to match the opencv version.