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$ wget https://www.python.org/ftp/python/3.6.3/Python-3.6.3.tgz

$ tar xvf Python-3.6.3.tgz

$ cd Python-3.6.3

$ ./configure --enable-optimizations

$ make -j8

$ sudo make altinstall

$ which python3.6
/usr/local/bin/python3.6

$ sudo ln -fs /usr/local/bin/python3.6 /usr/bin/python
$ python --version
python 3.6
$ sudo python -m pip install setuptools --upgrade  
$ sudo python -m pip install pip --upgrade
$ sudo python -m pip install pipenv