modulenotfounderror no module named 'selenium' but it is installed code example

Example: No module named 'selenium'

root@shashank-mbp /U/s/Downloads# tar xf selenium-3.141.0.tar.gz root@shashank-mbp /U/s/Downloads# cd selenium-3.141.0/ root@shashank-mbp /U/s/D/selenium-3.141.0# ls CHANGES LICENSE MANIFEST.in PKG-INFO