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There are several possibilities, /usr/bin/python or /usr/bin/python2 or even /usr/bin/env python. Ros melodic works with python2.7 so you should be using python2 not python3.

To confirm you are using right path for python, you can run /usr/bin/python or /usr/bin/python2 in your terminal, use the one which starts the python in the terminal.

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