pip install requirements error " Could not find a version that satisfies the requirement opencv-python==3.4.1.15"

[ShuangjunLiu]

By following the instruction, pip install -r requirements.txt

I still ran into following error:

"ERROR: Could not find a version that satisfies the requirement opencv-python==3.4.1.15 (from -r requirements.txt (line 2)) (from versions: 3.4.8.29, 3.4.9.31, 3.4.9.33, 4.1.2.30, 4.2.0.32, 4.2.0.34) ERROR: No matching distribution found for opencv-python==3.4.1.15 (from -r requirements.txt (line 2))"

It seems that there is no specific version required by the "requirement.txt"

[xiaosongshine]

在 "requirement.txt" opencv-python==3.4.1.15 改为 opencv-python==3.4.5.20

[danielajisafe]

I removed the version and used opencv-python only