python version 変更　mint 19

python -V

which python

ls -al /usr/bin/python

ls /usr/bin/ | grep python

root@deskmini:/usr/bin# ls /usr/bin/ | grep python
dh_python2
fail2ban-python
python
python2
python2.7
python3
python3.6
python3.6m
python3.7
python3.7m
python3m

/usr/bin/update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1

/usr/bin/update-alternatives --install /usr/bin/python python /usr/bin/python3.6 2

/usr/bin/update-alternatives --install /usr/bin/python python /usr/bin/python3.7 3

/usr/bin/update-alternatives --config python

python --version