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i run python3 --version it show python 3.5.2
which python3 is /usr/bin/python3
As of Ubuntu 16.04 LTS, Python 3 is default Python! Python 2 is only installed only when needed by packages - but because there is a lot packages who depends on it, so some package surely installed it too.
Keep in mind that Python 3 must be called by python3. python is reserved for Python 2, so it doesn’t break packages who depends on it.
Verify do you have python 3 by executing
python3 --version
Also you can get location of it by executing
which python3
Edit: reformatting answer…