There's my workaround
python -m pip install --upgrade pip
And it installed pip latest version 20.0.2 I downloaded some wheels opencv-python
from this link https://www.lfd.uci.edu/~gohlke/pythonlibs/#opencv . In my case I downloaded opencv_python‑3.1.0‑cp34‑cp34m‑win32.whl this wheel file
When I install downloaded wheel using upgraded pip. I got error about: PIP required python version 3.6 or higher
It seems PIP version 20.0.2 doesn't works with python 3.4 So which is the compatible version for python 3.4?
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