opencv-python version error

[JolluSK]

ERROR: Could not find a version that satisfies the requirement opencv-python==3.4.0.12 (from -r requirements.txt (line 3)) (from versions: 3.4.2.16, 3.4.2.17, 3.4.3.18, 3.4.4.19, 3.4.5.20, 4.0.0.21, 4.0.1.23, 4.0.1.24, 4.1.0.25)
ERROR: No matching distribution found for opencv-python==3.4.0.12 (from -r requirements.txt (line 3))

[davidjesusacu]

If you are using conda, you can try:
conda install -c menpo opencv