pip3 install cv2 ubuntu code example

Example 1: how to install pip ubuntu python2

curl https://bootstrap.pypa.io/get-pip.py --output get-pip.py

Example 2: how to install pip ubuntu python2

pip2 --version

Example 3: install opencv

sudo apt-get install libopencv-dev   # ubuntu c++

download required packages from below link:
https://docs.opencv.org/4.0.1/d7/d9f/tutorial_linux_install.html

NOTE: you can download required packages by "sudo apt-get install <packages>" or 
download source code by git using above link

tags: ubuntu, c++, opencv 4 version